by Alec61 on Wed Jan 04, 2012 12:08 am
Well Oscars are cichlids, and so are Angelfish... But they a basically not compatible.
First rule of keeping Oscars, nothing long finned and slow, and nothing that even looks small enough to fit in it's mouth So the goldfish are toast, probably the angel, maybe the gourami (depends on the species), a big Oscar could eat a rainbow shark etc.
Suitable tankmates are large plecocostomus (sucker fsih), well grown bala sharks, kissing gourami etc. All those fish can, like the Oscar, grow to a foot long, so you need some serious space. Start with 75gal for the Oscar alone, and then allow more for the other fish.
As for "Cichlids", there is a huge range, from about 1" long to 3ft. All sorts of temperaments.as well. Some are much bigger and way more aggressive than Oscars, others are little community fish.