Originally Posted by leeteekyung
sorry, i mean tolerate any water conditions/parameter like betta or gourami.
Angelfish, Tetra's, and Gourami prefer soft, water while mollies ,platy's,guppies,swordtails all prefer hard alkaline water to do well over the long haul.
Tetra's prefer cooler water 72 to 75 degrees F, while Angelfish and gourami prefer more tropical temps 78 to 82 degree's F.
When we try and mix fishes that don't all enjoy same water paramter's,, fishes often become weaker from stress, often become sickly, and seldom live to life expectancy.
Angelfish do indeed perform better in groups of five or more and this would require four foot long tank and fishes should all be same size.
Angelfish can grow larger than a man's hand, and would not hesitate to snack on smaller fishes and in the event a male and female decided to spawn,, then plan's to move the other angelfish in the tank lest they get beat up by the spawning pair,must be considered.
Mine is but an opinion based on observation's of the fishes mentioned, and is no more, or no less.