Originally Posted by Guppyluver4ever
do not get a cichlid, thats all i can say, oh wait you can get a RAM! they are a type of cichlid that have beautiful colors and are peaceful.
Not all cichlids are aggressive, as you have said yourself. They're only bastards when you don't do your research/use your head.
A female convict in a community tank would be absolutely non aggressive, look stunning and add some interesting behavior. Just don't introduce a male. Infinity females would be fine.
A ram, as you suggested, would also be great. Water perimeters permitting though. They won't tolerate anything alkaline. 5.5 - 7 is what you have to aim for with these guys. They like it hot too, 27-28C. Anything higher or lower and they get progressively easier to provoke and prone to disease.
A firemouth would be good too. They tolerate most water and look great. Female is the way to go here again, due to the difference in size between male and female.
I'm suggesting these cichlids because they tolerate wide parameters, are NOT aggressive and will go well with the current fish. The danios will make perfect dithers and and cories won't be seen as free swimming need-to-kill-for-territory fish.
How about a Boesemani Rainbow?
A neon blue Dwarf Gourami?
A Denison Barb (pushing the tank size a bit there)..?
Or, outside the box slightly, how about a nice school of fish?