Can't keep an otto alive in my tank

aaronburro

Medium Fish
Mar 27, 2003
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#1
Welp, I just lost another otto today in my 10gal, and I can't for the life of me figure out why. I had 3 ottos in a 10 gal, along w/ a betta and 4 cory's. The tank has been up for almost a month now and has been cycled for almost as long. All water parameters are in check and the temperature is an even 80F. I feed them an algae wafer every 3 days, though I never really know if the ottos get it or the cory's get it. I looked last night when I fed them the wafer and one of the ottos was sitting right on top of the food, so I assume he was eating it... Weird thing is, I think that the one sitting on the wafer is the one that died...

What am I doing wrong?

My additives are as follows: pH 7.0 buffer, Stress Coat, and Flourish Comp. Plant supplement, all once a week w/ the water change. The plants are one java fern, "two" odd java ferns that don't look like any java fern I've ever seen, and a pygmy anubias. The two "java ferns" and the pygmy were added this previous week along w/ the two ottos from the store that replace the previous dead otto.
 

Jun 28, 2003
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#3
Is there regular algae in the tank on the leaves of your plants that the Oto's can eat?

I always leave part of an algae wafer in my tank but they never touch it, they just graze on the leaves of my plants. I have to actually cause a little bit of algae in my tank so that they have something to eat.

Oto's mainly eat brown algae in thier diet, and have you checked your water parameters lately?
 

Lotus

Ultimate Fish
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Aug 26, 2003
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#4
If the otos have died soon after you bought them, I would blame it on the harsh shipping, and not your tank.

Otos are wild caught, and sometimes the shipping all the way from South America is too much for them. It's often best to wait until the store has had them a few days or even weeks, so you get the ones that are more hardy. They are pretty sensitive to ammonia, so you should make sure your tank has none before you buy them. New tanks will occasionally have small ammonia spikes, especially if you have been stocking.

Once they have settled in your tank for a few weeks, they are generally pretty hardy, although I did have one drop dead after a month for no reason I could tell.

Why are you buffering your tank? What's the pH from your tap?

I keep mine in fairly hard water with a pH of 7.8 without problems.
 

aaronburro

Medium Fish
Mar 27, 2003
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#5
i buffer cause my pH is hard to keep steady otherwise. Even w/ regular water changes crashes are common for me... :( Yes, there are some plastic plants that usually have good algae coverage on them, and I often see the little guys munching on the algae-covered plants... All three of them went to town on the algae on the side of the tank one night, after having ignored it for a week!