06-29-2011, 07:19 PM
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I would not recommend a Firemouth with those small fish. While it is "peaceful" for a cichlid, it is still a cichlid, and at 7 inches should not be housed with fish other than appropriately-sized ones. The Odessa Barb is the only fish listed that should be suitable.
As for angels, they should be in a group of 5+ as they are shoaling fish. A 55g is fine for this, although the active Odessa Barb are not good tankmates. And the guppies will be eaten for certain once the angels are mature.