That sounds like it could be right, although I thought we'd allowed plenty of hiding space for them all. I've got some more spare pvc tube I can try adding, the other two love that, or if that doesn't work I'll dig out some small bits of bogwood and make him his own cave.

Would I be right in ...

Surely if they weren't happy in a group of three they'd all exhibit odd behaviour, not just one? Although I accept that a larger group would be nicer, and it will be a possibility after christmas when I can think about upgrading my own tank leaving my old one free for a group of perhaps six or seven.

There's a large cave-like area created by an arched piece of bogwood and also a length of pipe hidden at the back of the tank. The other two use both of these so there is always one big space free for him to hide in.

My boyfriend was given a 22 UK gallon tank for free by a work colleague a month or two ago and immediately demanded 'whiskery fish', i.e the pictus cats he always liked to have a look at while I browsed the fancy goldfish in our lfs. :roll: After borrowing one of my fish to cycle the tank with he ...