Dark Bolivian Ram

[Fishperson]

Well, my bolivian ram has turned dark and stays near the floor of the tank, with it's fins kind of clamped. It's just resting there. Earlier, I saw it spazzing out on the floor of the tank. The tank is a 20 gallon high, and the params are, as of 30 minutes ago:

0-.25 ppm ammonia
0 nitrite

I haven't gotten around to testing ph or nitrate, but will do so soon and will update.

If it helps, I introduced 3 otos about a week ago. They went to town on all of the diatoms, and didn't show any signs of disease except for 2 things:

1 had minor fin rot, which is already pretty much gone.
Another had 2 small reddish spots, right in the middle of its belly. The others didn't have it, so I kept an eye on it and it went away already.

Anyway, the ram has been like this for maybe 2 days now.

I don't know what it is. The other tank mates are 6 bloodfin tetras, and 6 rummynose tetras. The tank finished cycling march of this year, and the ram was added in late may.

Any help would be great!

Thanks!

 

[Fishperson]

I did some research, and in all these threads there hasn't been a common conclusive result. The 2 most common things were:

Bacterial infection
Neurological problem.

Either one wouldn't make sense though, because I've had this ram for 3 months at least, so why would it just develop a neurological problem? And none of the other fish are having problems so it probably isn't bacterial.

Hmm.... It's a mystery I guess. I put him in a breeder net, and he's doing a bit better.