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Yeah, I was thinking the same thing......What size tank is it? How big is the hippo?
Glad you are planning to move them. ~30 gallons is way too small for a hippo. I’d made sure he can’t jump out for now and get him to the bigger tank as soon as you can. I suspect the odd behavior could be to space limitations and territory. It’s probably very stressed. IMO they need pretty much the same territory regardless of age/size to feel safe. What they do need as they grow is swimming space.It’s a 33 gallon tank. The hippo is about an inch long. The only other fish are a pair of clowns and a Midas Blenny. I am going to move him, and them, to a larger tank (90-100 gallons) in a month or so. He seems fine during the day. Swims and picks at the rock work and coral frag plugs. Only thing that worry’s me is where he sleeps.