09-17-2010, 08:38 PM
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Hi and welcome to Tropical Fish Keeping forum.
First off, we have a section here called Tropical Fish Profiles, second tab from the left in the blue bar at the top, or you can click on shaded names of fish and plants in posts to see that species profile. The profiles include info on tank sizes, compatibility, numbers needed (many fish are shoaling fish, like angels, more on that in a moment), water parameters, etc. A community tank to be successful must have fish that have similar requirements in all these areas. Otherwise, the fish are stressed and that leads to health issues.
Angels are shoaling fish; a group of 4-5 in a 55g could be a beautiful display. They need plants and branches to replicate their natural environment, as noted in the profile for Pterophyllum scalare and Pterophyllum altum.
The Firemouth, gourami and paradise fish together is asking for trouble, and adding angels likewise.
With a group of angels, a shoal or two of medium characins would work, one of the rosy tetra clade (Hyphessobrycon species), or medium rasbora. Remember, small fish will be eaten by angels. Barbs and danio are too active for the sedate angelfish.
Plants in the Echinodorus genus (swords) are ideal for angels, and in a 55g would be ideal.
These are just general guides to start.