do a search on lake Tanganyikan fish. there are also lots of threads on the subject in this section of the forum.
to give you some idea i have a 2ft tank and keep
1 calvus
2 punks
1 masked juli
6 zebra danios that act as dithers
fluval 105 filter
so far my fish are getting on fine, there is the usual stand off now and again but nothing serious or violent.
in 3ft you could get away with 3-4 cryps. these stay higher in the water column (the others swim in the rocks and lower to the substrate), swim together and have really nice colours.
you could have a really nice tang tank.
to give you some idea i have a 2ft tank and keep
1 calvus
2 punks
1 masked juli
6 zebra danios that act as dithers
fluval 105 filter
so far my fish are getting on fine, there is the usual stand off now and again but nothing serious or violent.
in 3ft you could get away with 3-4 cryps. these stay higher in the water column (the others swim in the rocks and lower to the substrate), swim together and have really nice colours.
you could have a really nice tang tank.