Even if your sharks are 2 inches now, they will grow extremely big very fast. Good luck.
Also, your catfish is probably acting weird because his friend died. I had a pair of Angelfish once, one of them died (got eaten by a Vampire Pleco) and the other one died after. The second one did not get eaten or picked on, did not have any disease, and was not stressed. He just died, possibly because of "loneliness".
Get him another friend!
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