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Old 09-30-2006, 08:09 PM   #11 (permalink)
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Hoppy,

not sure if I follow how that relates, though it is amusing. If you are refering to using Excel as an "algae repellent or algaecide, that's not my intention. I really like excel but is very expensive in any quantity. If glutaraldehyde is an economical substitute, I'm all for it
I like Excel too, but when I hear of a tank that is always crystal clear without a bit of algae......well, it reminded me of George's testimonial to heating cables. Sorry, my laugh reflex gets out of synch sometimes.
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Old 09-30-2006, 08:14 PM   #12 (permalink)
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Nice work Allen! I look forward to hearing more and getting some of the gluteraldehyde once you reveal your source

I do have a question though, is the Gluteraldehyde a 2.8% solution or are have you mixed it to obtain a 2.8% solution?
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Old 09-30-2006, 08:19 PM   #13 (permalink)
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I am very interested in this thread. Please post more info about how you got the Gluteraldehyde and its long term effects.
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Old 09-30-2006, 09:54 PM   #14 (permalink)
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Hi Matt

I did a search for glutaraldehyde and found a number of places that sell it online.The solution i ordered is 2.5%.There are other concentrations out there.The higher level of glutaraldehyde the more expensive it is.I chose this one to experiment with because of the price and it is diluted enough that I could dose straight from the bottle.

This is only the first week of using it so I not sure if there will be any problems with long term expose for the fish or plants.
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Old 09-30-2006, 11:49 PM   #15 (permalink)
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The MSDS at Seachem clearly states that the major chemical in Flourish is glutaraldehyde. I doubt there will be long term effects with the use of only a 2.5% solution of glutaraldehyde

I think the increased concentration of glutaraldehyde is responsible for killing of 'fragile' algae when people dose 2x-5x the regular dose to get rid of algae.
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Old 09-30-2006, 11:54 PM   #16 (permalink)
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Quote:
Originally Posted by dennis View Post
I was reading some companies MSDS sheet for it and it mentioned something like 'toxic to aquatic life in at .1 to 1.0mg/l for the most sensative species'. They never mentioned the species but a guess is that the cloudy water some get with high doses of excel is due to a die off of bacteria.

If I have done the math right (I probably have not ) then a 30 ml dose of 2% solution in 60 gallons is .26mg/l, pretty low on their "toxicity scale". That would lead me to belive that the most sensative organisms would be affected. Higher dosing woudl robably affect shrimp or snails, and lastly fish.

Using the same math, 5ml in 10 gallons is about .3mg/l. As I said though, I may not have converted to mg in a 2% solution correctly. I based my figuring on 100g/mol, or 10^5 mg/mol and assumed that one could figure a 2% mol solution in 1liter H2O. Please tell me if I am wrong.
Assuming the 2% is weight-by-volume: 2% w/v = 2 grams / 100 mL

30 mL in 60 gallons:
(2 grams / 100 mL) * 30 mL = 0.6 grams in 30 mL of the 2% solution.
If you add it to 60 gallons of water, 60 gallons * 3.78 L / gallon = 226.8 L
0.6 grams / 226.8 = 0.26 mg/L


5 mL in 10 gallons: (Still 0.26 mg/L since the solution volume and tank size are both 5 times smaller)
(2 grams / 100 mL) * 5 mL = 0.1 grams in 5 mL of the 2% solution.
Adding it to 10 gallons = 37.8 L
0.1 grams / 37.8 L = 0.26 mg/L
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Old 10-01-2006, 04:47 AM   #17 (permalink)
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Quote:
Originally Posted by allen View Post
I did a search for glutaraldehyde and found a number of places that sell it online.The solution i ordered is 2.5%.There are other concentrations out there.The higher level of glutaraldehyde the more expensive it is.I chose this one to experiment with because of the price and it is diluted enough that I could dose straight from the bottle.
Thanks for the info. If all goes well this should be another big money sver for the hobby.

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Originally Posted by allen View Post
This is only the first week of using it so I not sure if there will be any problems with long term expose for the fish or plants.
I don't think you are going to have any problems as long as you keep the dosing similar to Excel. Assuming Epicfish's calculations are correct I think it is funny that the Riccia in the 10g had issues while the riccia in the larger tank did not. Do you think this may be because the gluteraldehyde was diluted more in the large tank due to the tank's height? Did yo add the gluteraldehyde directly over the Riccia in the 10g?
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Old 10-01-2006, 07:25 AM   #18 (permalink)
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Quote:
Originally Posted by epicfish View Post
Assuming the 2% is weight-by-volume: 2% w/v = 2 grams / 100 mL

30 mL in 60 gallons:
(2 grams / 100 mL) * 30 mL = 0.6 grams in 30 mL of the 2% solution.
If you add it to 60 gallons of water, 60 gallons * 3.78 L / gallon = 226.8 L
0.6 grams / 226.8 = 0.26 mg/L


5 mL in 10 gallons: (Still 0.26 mg/L since the solution volume and tank size are both 5 times smaller)
(2 grams / 100 mL) * 5 mL = 0.1 grams in 5 mL of the 2% solution.
Adding it to 10 gallons = 37.8 L
0.1 grams / 37.8 L = 0.26 mg/L
Cool, I was right; though I see I took a more complicated path to get there. As for the calculations for 10 gallons, I was assuming 8.5 gallons since the standard 10 gallon tank is only about 8.5.


Allan, could you share where you ordered it from since obviously you had a safe and easy transaction?
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Old 10-01-2006, 11:15 AM   #19 (permalink)
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Urea instead of KNO3, KPO4, and KSO4 (if a K supplement is needed), and trace with Plantex CSM+B.

This should be interesting. =)
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Old 10-01-2006, 11:38 AM   #20 (permalink)
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Urea - Science Kit and Boreal Laboratories seems pretty cheap, compared to a place like this: Urea, FCC

Seems like these stores carry pure urea crystals as well as prilled urea (pellet form). I don't know how pure the prilled form is, so let's assume I get the crystal form of urea.

2.5% urea = 2.5 grams / 100 mL water
mL water required = 500 grams * (100 mL water / 2.5 grams) = 20,000 mL = 20 liters

From the cheaper site, for $15.50 plus shipping, you can get 20 liters of 2.5% urea!! Heck, if the prilled form was water-soluble and pure, it'd only be $8.70 plus shipping for 20 liters.

Urea crystals, if stored in a dry environment, aren't prone to decomposition, while urea solution is. So of course you shouldn't mix up all 20 liters, maybe a couple hundred mLs at a time.
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