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Do dwarf otos eat this kind of algae?
I've never heard of 'dwarf' ottos, but my regular ottos don't do much with it.

BTW, I scraped it last night after another 3+ weeks. It was much less than the time before, so I'm keeping my fingers crossed.
 

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Bert H said:
I've never heard of 'dwarf' ottos, but my regular ottos don't do much with it.
Just another name for otocinclus affinus aka pygmy suckermouth catfish aka dwarf sucker.

So your ottos didn't do much to the GDA? Bummer ... I was thinking of getting some too.
 

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The primary grazers on my GDA were the common pond snails, which grew about 5 times as big as I have seen before. But, the oto also had a feast. Having only one, he didn't make nearly the big dent in the supply that the snails made. The guppies also spent a lot of time picking off pieces of it. Apparently GDA is a nutritious vegetable treat. The GDA(?) which showed up as green fuzz on the plants disappeared with the GDA on the glass, but I don't know if it was eaten or what.
 

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hoppycalif said:
The primary grazers on my GDA were the common pond snails, which grew about 5 times as big as I have seen before. But, the oto also had a feast. Having only one, he didn't make nearly the big dent in the supply that the snails made. The guppies also spent a lot of time picking off pieces of it. Apparently GDA is a nutritious vegetable treat. The GDA(?) which showed up as green fuzz on the plants disappeared with the GDA on the glass, but I don't know if it was eaten or what.
Yes, I noticed when I had snails I hardly ever saw any significant GDA accumulation on the glass. But, back then I perceived the snail infestation as a "problem", so I bought 3 yo-yo loaches to handle this problem. So now, no more snails but now algae. D'oh!

I wonder if I could get bigger snails that will eat the GDA but won't get eaten by the loaches.

Anyhow, I went ahead and bought some otocinculus. I think I lucked out too because I got so-called "Giant Otocinculus". Apparently, this species is somewhat on the rare side. We'll see how well these guys will handle the GDA.
 

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John P. said:
Nerite snails?
Hmm .. I just Googled for them and they sound terrific. They eat algae. They don't eat plants. And they don't reproduce in freshwater. Whats not to love?

However, I'm afraid my yo-yos might make a meal out of them. I read these snails grow to 1/2" to 1". That might be too big for the yo-yo, but I don't know for sure. Only one way to find out!
 

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AFM had an article recently on snails and other critters and apparently you can keep your snail population at bay by simply not over-feeding the tank. Never heard that before but it makes sense.
 

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John P. said:
The only reason I haven't used them is they lay eggs often
Oh? Why is that a bad thing? Do they pollute the water or something? I read they don't hatch in freshwater.

Maybe my yo-yo loaches could eat the eggs if they don't eat the snails.
 

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Well just an update on my tank....

After weeks of the green dust algae my glass is 90% gone and clear except for the white residue it leaves.....It was a tough one to wait out but im glad I did!

Sucess!!! Thanks Tom Barr even though he wont see this!
 

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Ottos eat all your GDA?? I have three in a 29 and they don't even make a dent.

Also for those without the patience for Barr's method, I seem to have found something that seems marginally effective.

Overdose Excel to your tank and then immediately after you do that scrape all the glass- I use a credit card. I thought this might work to kill lots of the spores and it seems to because this week the GDA is coming back way slower, but alas it is still coming back. I am going to repeat this process and see if over a few weeks I can't eradicate it completely.. I doubt it will work.. but it's worth trying.. I just couldn't stomach looking at my poor tank all covered with green funk on the glass.. was too much to handle for more than a couple weeks..
 

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Well no, they did not eat all the algae. I first reduced intensity and duration of light. Then after a few days the algae started to fizzle out in most areas in the tank. However it lingered up near the top of the tank where the light was most intense. Then I added ottos.

The ottos ate the remainder and since then it has not come back. So the algae took a beating from less light and then the ottos ate the rest of it and I assume keep it from growing up near the top.

What a horrible algae. I am soooo glad it has gone... It really was painful to see it every day...
 

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banderbe said:
Ottos eat all your GDA?? I have three in a 29 and they don't even make a dent.

Also for those without the patience for Barr's method, I seem to have found something that seems marginally effective.

Overdose Excel to your tank and then immediately after you do that scrape all the glass- I use a credit card. I thought this might work to kill lots of the spores and it seems to because this week the GDA is coming back way slower, but alas it is still coming back. I am going to repeat this process and see if over a few weeks I can't eradicate it completely.. I doubt it will work.. but it's worth trying.. I just couldn't stomach looking at my poor tank all covered with green funk on the glass.. was too much to handle for more than a couple weeks..
Interesting you say this. I let the GDA get to almost the end stage... Thick film on the glass that swayed in the current, then it started to die from the top of the tank down, just turning white. The "tufts" of it on the driftwood and what was growing on the plants had started to bleach out too. So I scraped it off the glass with a credit card and did a 3x OD with Excel. I was thinking "hey, Excel worked for BBA, I'll try it on this crap."

I'll let you know how it went. I won't be around to see it personally, as I'm moving, but I'll ask my mother to give me a report on how it's doing.

"GDA" is exactly what I'd call this stuff... but sometimes the GD doesn't stand for "green dust," if you get my drift! :mad:
 

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I've found this works to lessen GDA

1) Let the GDA build up,
2) Scrape the glass,
3) Do a large water change
4) Stop EI dosing/add only micros and potassium
5) Repeat 2, 3, & 4.
 

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As some suggest, lowering the light does help prevent/slow down GDA. On the other hand, how do we grow light-intensive plants? Specifically, I have HM (grows like weed), some HC, and as of recently glosso (it's a 375 L / cca 100 g tank). In my earlier (lower light) set-ups I never had GDA problems, however, now with lots of T5s, GDA is my biggest enemy.

And just to share with you, Alternathera R. seems to be a real magnet for this menace - Alternathera grows fast, but only the newest leaves are not plagued with GDA. I am at a point where I am considering kicking it out altogether. I am hoping that once GDA goes off the glass, it will also leave Alternathera alone.
 

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I would like to join the club of those who kicked-out GDA, using the 'do-not-disturb for 4 weeks' method. After 1 month, I wiped the glass, did 20% water change, and 10 days now my glass is spotless (well maybe a few dots of GSA). GDA in some form is still on my rear glass, but I don't mind.

I still have a minor case of BBA, but CO2 and Easy Carbo should take care of that.
 

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Ugh, I just redid a 29 after a year or so of neglect with no light fixture or CO2. I have been constantly battling this GDA (not the nice abbreviation either) since then for the past month or so. Glad I stumbled across this thread, I'm going to try the "wait and see and then scrape" approach. If it works, I'll post it up on here. I really hope it works, this stuff is ridiculous. I know this is an older thread, but I think it's a good one to keep going, especially since this is a common algae and this strategy apparently works.
 

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Well, about halfway through this month long business, and I'm already sick and tired of staring at a green box. I miss my plants, and my fish :( Hopefully, when this is all said and done, it will work; I don't think I can suffer through another month of this algae. I cut back my lighting by half, that room gets a lot of sunlight (and in Alaska in the summer, that is a *lot* of sunlight) and I hope that'll help. I should post a picture of it, the algae is waving in the water-breeze. That being said, it's given me lots of time to catch up on my 10 gal natural tank and give it some much needed care.
 
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