Thanks for the reply. I suspected that it might be that, but I was hoping that my ID was wrong.

I am just hoping that my efforts to convince him to relocate the fish are successful.

I was recently asked by an old acquaintance to help out with some fish that he took under his supervision, since he knows very little about fish care. The previous tenants that lived in the same residence as him left them behind.

I have the rest of the fish IDed but I haven't been able to identify ...

I would say that high temps are a problem with Oto's. They generally live in areas with flowing, relatively cool water. Salt isn't gonna do them any good either.

So you may well be treating the Ich and causing the fish stress in other ways...

The oto in question died a few days ago. There wasn ...

Lets start with the basics - what's your water quality:
nitrate (NO3), nitrite(NO2), ammonia(NH3/NH4)?

NH3/4: 0
NO2: 0
NO3: about 10ppm, give or take 2ppm. (Test kit scale is a little harder to read at the lower levels)

What's the temperature?

84 degrees Fahrenheit. I'm treating ich right ...

Update: The oto is so emaciated that I'm pretty certain he's not going to make it.

He doesn't eat diatoms, nor zucchini or anything else that I can see. He just hangs out in random places and sits there, doing nothing.

Is there anything I can do? Or should I be faced with the fact that I will ...

I've had success with the zuchinni but make sure it isn't floating on the surface or they'll never get it. Peas did not work for me, but even more affordable is seaweed. I have been using sushi grade seaweed for this sized about 4 by 1 inch and clip it to the wall of the aquarium.

I started ...

I would be wary to feed ottos algae wafers on a long term basis. Most "algae" wafers are between 30% and 40% protein, which is way too much for a vegetarian fish. Too much protein can cause bloat and digestive problems. Algae wafers are better for omnivores like Peckoltia and Baryancistrus .

As ...

You should get at least one more otocinclus. They love to be in groups and can get very lonely when left alone.

He was alone at the LFS, aside from this other otocinclus shaped fish that looked almost like it had blisters? I wasn't too sure if that was the natural skin of the fish or if he was ...

I recently purchased one Otocinclus for my 10 gallon dwarf puffer tank.

He's rather thin and I'm hoping to fatten him up. What are the best foods to feed? There are plenty of diatoms in the tank, and I'm feeding blanched zucchini every day, which he nibbles on, but it doesn't really look like he's ...

http://www.reptilescanada.com/gallery/data/500/otocinclus.jpg

I bought this little guy at a petstore, simply labeled "Otocinclus catfish".

I've used the Cat-eLog and haven't been able to positively identify him.

Sorry for the blurry picture, my camera has been tempermental and hasn't let me get ...