When I get my 90g (48 1/2 x 18 1/2 x 25 3/8) I want to have 1 BGK, 1 african knife, 3 senegal bichirs, 3 ropefish, and 1 small eel (one that doesn't get bigger than 6-12 inches, probably a peacock eel). I was wondering whether this is overstocked and if not, whether there is any other fish I could add? Like a middle/top dweller that definitely won't get eaten by any of those fish.