08-19-2012, 04:31 AM
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Oye. Rainbow sharks can be brutal, Pictus are happy but speedy greedy feeders and ready eaters of anything they can fit in their big old whiskery maw, and the poor little cory cats: kiddo, you barely have room for the three of them!
My advice is to rehome the pictus and the shark: there is nowhere near enough space for either of these fish to mature and to expend their boisterous (and that's putting it nicely) energy. These fish are sort of impossible in tanks less than 55 gallons or more, mostly owing to their attitude, rather than their size.
You have also selected five substrate-oriented fish and locked them in a ten gallon glass box. They will necessarily be all the more belligerent because they can't get out of each others' way! This is like extreme cage fighting: five may go in, but I'll bet only one will come out.
Edit: A Pictus Cat that won't eat piggishly is already gorged or ill. These fish should be fed, and then allowed to fast a couple days a week like many predatory species. Sometimes that silver tummy looks like an old silk throw pillow ready to burst at the seams. And this is another reason they are not good community fish: you cannot fast them in a tank containing cories and sharks, which must eat daily. Pictus eat everything in sight. I am surprised the rest of your fish haven't starved. In any case, it needs to come out of there for good. Isolate it and let it fast for a day or so and see if it will eat then. Do not put it back in this tank. If it still refuses food, there may be something more sinister than gluttony at work, but you should assess that issue as it arises. Cats are tough to treat with medications and at this point I have no clue what disease (or medication) we may be talking about.
Last edited by sidluckman; 08-19-2012 at 04:41 AM..
Reason: added content