a pair of dwarf cichlids, guppies, endler's, mosquito fish, a pair of cherry barbs, umm....
Don't breed guppies in a 6g tank unless you plan to move the fry to bigger tanks in a month or so....or maybe you only had 4 fry to grow. The juvie fry eventually will die or get stunted due to excess bio-load.a pair of dwarf cichlids, guppies, endler's, mosquito fish, a pair of cherry barbs, umm....
Don't breed guppies in a 6g tank unless you plant to move the fry to bigger tanks in a month or so....or maybe you only had 4 fry to grow. The juvie fry eventually will die or get stunted due to excess bio-load.
Endlers will fill-up the tank very quickly because they don't eat fry (unlike most guppies), and those same fry will sexually mature quite early and start breeding as well.
I have not raised cherry barbs, but a good friend does, and he explained to me that unless the tank is big (20g or more), a pair will keep on chasing each other and possibly stress each other too much, and can make them vulnerable to disease. Imagine the stress when they chase each other non-stop on a small 6g.