You could go with a Dwarf Puffer, two at a push if it has plenty of plants and decent filtration.
As for your lfs, they haven't given you the right advice, I'm afraid. Barbs are shoaling fish and do a lot better in a group. Your Tinfoils may be small now but when they get bigger, they will become a threat to your other fish. Not only are they boisterous but they will also cause havoc if the tank isn't big enough.
I know you say about rehoming your Common but the longer you keep him, the more attached you'll become. They are great characters and not easy to part with when the time comes.
We end up having to rehome quite a few Commons/Gibbiceps at our store because they've outgrown the tank. Unfortunately, not many of them will be rehomed as people only want them when they are small so they can watch them grow.![]()
Oh, I see. Well I spoke to my LFS today, and they said they would exchange happily - I was looking at a crown pleco, and some rainbow fish as replacements. Thanks for the advice Stang.
