06-10-2012, 08:21 PM
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Your water is fine for soft water fish. Livebearers however will not be healthy since there is insufficient mineral, so leave out the platy, molly and swordtail as has been suggested.
Angelfish are shoaling fish, they need a group; in a 50g, assuming it is 4 feet in length, you can have a group of five angels. Acquire them together to avoid problems. This is explained in our profile, click the shaded name Pterophyllum scalare.
I agree with not adding cardinals with angelfish. Any of the "torpedo" shaped smallish fish will likely be seen as food by angels as they mature, so the rummys will be similar. Sometimes if the angels are acquired very young and grow up with these fish around them, there is less chance of predation...but it is still natural to the fish, we can't alter nature. Better tankmates are the disk-shaped characins such as some of the species in the Rosy clade of Hyphessobrycon. Several are in our profiles, just avoid those that are prone to nip fins. Rosy Tetra, Roberts Tetra, Black Phantom Tetra are fine. Substrate fish are usually OK. Many of the cory species will work.
The above has assumed you get angelfish. If not, then the cardinal and rummynose are fine, in larger groups as someone suggested. As for gourami (not with angelfish) here you run into some similar/other issues. Males are territorial, so depending upon species, one male and 2-3 females can work. Tankmates must be quiet, not active swimmers (this applies to the angels too), nor prone to nip fins. Most of the commonly-seen gourami are in our profiles.
Last edited by Byron; 06-10-2012 at 08:24 PM..