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I have been keeping dwarf shrimp for about 5 years beginning in late 2003. At first I only had Amano and Cherry Shrimp since they were the most commonly available species at the time. In December of 2006, I set up a shrimp rack that would hold twelve 10 gallon tanks for breeding shrimp. In addition to the Amanos and Cherries I collected several varieties of shrimp including, Crystal Reds, Yellows, Blue Pearls, New Bees, Blues, Snowballs and Dark Greens. For some reason, I was not getting many baby shrimp even though most tanks had at least one berried female in them at all times. All of my tanks had planaria in them and I had been assured by some local hobbyists that planaria were harmless to shrimp. I have since found this article: TheTrouble with Planaria, and have come to the conclusion that the planaria were indeed detrimental to my shrimp population.

Then, on the 4th of February, 2008, I noticed a young Snowball Shrimp falling lifeless to the substrate. A berried female was on the thermometer and she appeared to be releasing new born shrimp. After a close inspection of the thermometer, there were several Hydra on it. Upon seeing this, I came to the conclusion the Hydra had killed the newborn Snowball Shrimp. This is purely speculation since I did not see the Hydra actually kill the shrimp. Not only do I have planaria in my tanks that can harm my shrimp, but I also have hydra whom seem to be responsible for at least one shrimp death.

Though I prefer not to medicate my tanks, I decided to take action and look for a cure to my problem. I have seen flubendazole mentioned as a medication against planaria, but it is very difficult to find here in the United States. I decided to try using fenbendazole (a medication used to de-worm household pets and livestock) after searching for flubendazole unsuccessfully and attempting manual removal of the planaria and hydra over the course of several months.

Fenbendazole is most easily found as a dog de-wormer and can be purchased at most pet supply stores. I used the "Safe Guard" brand labeled for dogs. Panacur is another brand name product that can be used. The price was about $14 for four 1 gram packs. This was the smallest size available at my local fish shop. Online information is "sketchy" at best for using this medication in aquariums. Some people describe using a "pinch" of the powder for their tanks or using a "BB" sized measuring spoon for their tanks. Most accounts do not give the volume of their tanks so figuring out a dosage from their information is next to impossible. The best information I could find suggested using a 2ppm dosage to de-worm fish. I was worried about the effects on shrimp with this dosage so I calculated a much smaller dosage for my shrimp tanks. According to the package, one gram of the powder contains 222mg of fenbendazole. Therefore, 0.1gm would contain 22.2mg and this would be about 0.6ppm (can someone please double check my math) dose for my 10 gallon tanks.

I added 0.1gm of fenbendazole to my 10 gallon Amano and Blue Shrimp tank on the 5th of February. This tank had both planaria and hydra present. On the morning of the 6th the planaria seemed to be gone but a few Hydra were still hanging on. On the evening of the 6th, I added another 0.1gm dose of fenbendazole and by the time the lights came on in the tank on the 7th, all the Hydra seemed to be shriveled up and dead. The shrimp, snails and two Rasbora espei in this tank were doing fine.

I decided to go ahead and dose my 10 gallon Cherry shrimp tank with the same dosage on February 6th. This tank had planaria but no apparent hydra and the dosage was effective on the planaria by the next morning. As with the Amano and Blue Shrimp tank, no effects on the shrimp were noticed.

On February 10th, I dosed the remainder of my shrimp tanks (8 additional 10 gallon tanks) with 0.1gm of fenbendazole each. I decided to wait 48 hours (instead of the 24 I waited on the Amano and Blue Shrimp tank) before adding the second dosage to see if a little more time will kill the hydra. The single 0.1 gram dose of fenbendazole worked for both the planaria and hydra in all of my tanks when I waited 48 hours versus 24 hours. A water change was not completed on any of the shrimp tanks after adding the fenbendazole due to it's insolubility. All tanks received their normally scheduled, weekly water change on the 13th of February.

I do not know if the fenbendazole has any effect on the beneficial bacteria at this point. Since I have such a low bio-load in my shrimp tanks, I did not test for ammonia or nitrites prior to adding the medication. If I have to re-medicate the tanks in the future, I will increase the bio-load prior to treating and check both the NH3 and NO2 levels before and after dosing.

Since shrimp can be very susceptible to most medications, shrimp only tanks can be can be very difficult to rid of pests. A 0.6 ppm dose of fenbendazole seems to be highly effective against both planaria and hydra in shrimp tanks and does not harm shrimp, snails, or other fauna, at this dosage. Four months have passed since first dosing fenbendazole in my shrimp tanks and the planaria and hydra are still absent from the tank. Every species of shrimp has bred successfully for me to this point, even the Amano Shrimp. However, I have been unsuccessful thus far in raising the Amano larvae. A smaller dose of fenbendazole may be effective against planaria and hydra but I have not experimented with it yet.

Note: Measuring 0.1 gm of fenbendazole is difficult for most hobbyists. Since it is very insoluble in water, I have suggested to fellow hobbyists that they simply divide one 1 gram packet into ten equal parts and add one of these parts for each 10 gallons of water. So far, everyone has had success using this method. If measuring a 0.1 gram dose is not possible, a water change after 48-72 hours would probably be a good idea.
 

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Great article Matt. I was always under the impressive that the planaria and hydra were harmless as well. I'm glad to know there's a medication that won't kill the shrimp as well.
 

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That's good to know. If I add some fish to my tanks won't they eat these? I understand you were referring to shrimp only tanks.
There are some fish that are reported to eat Hydra and Planaria but they will also eat baby shrimp. I suppose just like getting fish to eat algae, you will need to keep them pretty hungry.
 

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Article is very good. I have use larger doses that what Matpat recommends and have had no problems. In fact hydra dies within hours. I did a water change after 24hrs.

This article has been very useful. Persons in different forums have been pointed to it and have use it.
 

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I need some feedback regarding the use of fenbendazole. I dosed my tank tonight with an estimated .2 grams for my 20 gallon tank. Many of you mentioned how insoluble the medication is and so I mixed it in .1 gram batches in a shaker bottle with some tank water. I shook each batch for more than 5 minutes each but it seemed to barely dissolve. I poured it anyways and I can see the white granules coating the plant leaves, etc.

I expected the planaria to drop dead right away but they seem to be crawling around without any effect. What gives? Is it because it was not completely dissolved? Did any of you experience the same thing? Will the granules eventually dissolve in the tank?

The plus side is that it doesn't look like any of the fish or shrimp seem affected by the fenbendazole. I have guppies, snails, RCS, ottos and pygmy cories.

I am not running any filtration but just added a propeller style pump in the tank tonight.

I am planning on monitoring the effectiveness of this for 24 hour hours and then adding additional meds. What do you think?

Feedback please. Thanks.
 

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Fenbendazole does not dissolve in water very well at all. I tried the same thing you did and pre-mixed it in a small container. I must have shook the container for 10 minutes and it still did not dissolve. You will have white granules in the tank but mine have always disappeared by the next morning. It does not have an immediate effect on the Planaria and seems to take 12-24 hours to be effective. It takes 24-48 hours to be effective against Hydra at the 0.1gm dose.
 

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very helpful ! I am battling these things right now, !! I am going to the store today to buy what I can find with this info . I oray it works, my worms do not look' like the flat worm, but I have to get rid of them !!!! thanxs for the info !!!
 

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Thanks for the advice. The first dose got rid of 90% of the planaria and it took a few days. I just added a tiny bit more to the water last night to get the last few guys. No change in behavior in the fish or the shrimp. I have also observed the shrimp fry and noticed they were behaving normally. No water changes performed. Kudos to this article and the contributors!
 

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Fenbendazole can be bought as a liquid under the name Panacur or just ask for liquid Fenbendazole It mixes very easily with water. You can get it at a Vet, reptile show or Pigeon/bird supply store . You can also find it through the Internet. I use this stuff for my reptiles as a dewormer.
 

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I've just treated the tank with about 0.15
grams of panacur, the tank's a 25 gallon. I am erring on the side of caution. will it work at this dosage?
 

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This is really interesting. All the sites about tank critters I've come across say hydras are harmless, BUT I always noticed how my apple snails seemed to be 'stung' when they touch/slide over a hydra. I've seen it close up; I have had lots of hydra in my tanks. Sometimes the snails got a little swelling on their antennae where they touched the hydra that went down after a few days.

Hmm, if it hurt an apple snail... think of what it could do to a sensitive little shrimpy?

I dont actually have hydra anymore. I had so many so I just scraped the glass everyday, which pretty much got rid on them? It might of been other things too. Now I have HUNDREDS of copepods/ostracods, little white wormy things, and some planaria. :rolleyes:
 

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Article is very good. I have use larger doses that what Matpat recommends and have had no problems. In fact hydra dies within hours. I did a water change after 24hrs.

This article has been very useful. Persons in different forums have been pointed to it and have use it.
does any one know if this is okay on planted shrimp tank?
 

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does any one know if this is okay on planted shrimp tank?
i've used mine on my el natural planted tank with red cherry shrimp and they don't seem affected at all. i dosed the tank back in August and have not changed the water. all is fine with the shrimps. they are still breeding like crazy and appear active and healthy.

i think that the medicine wears off over time as i noticed a few planaria in the tank recently which i took out with long tweezers. it also greatly controlled my snail population. i still have plenty of MTS and pond snails but they are not in the plague proportions as they were before.

so i'd say this is safe for cherry shrimp. hope this helps
 

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I want to say, I used this on the two tanks that were affected. I am unsure, but I think it did kill off my nerite snails I had in the tanks at the time. So I might warn that it is possible to wipe out your nerites. Other than that, not a hydra left. I think I did od by mistake the one tank because the hydra all fell off within an hour of treatment.

Worked well. Just remove all "pet" snails
 

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I have used dosages of aquarium salt and peroxide to kill off both planaria and hydra in the past without any problems to shrimplets. Just pointing out another potential option......

Nice article, Matt!
 
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