08-20-2012, 04:57 PM
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Most I'm familiar with, and others around here keep are freshwater and not brackish.
For that tank, check the lights with it. If it has the typical multiple T5HO tubes marine tanks have that's wayyyy to much for non-marine tanks. A single or double T8 is more than sufficient.
You ask for aggressive fish ... that don't fight each other ... kind of an oxymoron ;)
Cichlids are typically aggressive and you must be very careful what fish you get, I don't know enough about them to offer any suggestions. They are messy fish though, so need large filtration and/or a sump.
But, can't suggest fish without knowing your water pH, GH, and KH. Those are key, and not something you'll want to mess with lowering. Raising is pretty easy (for example for African Lake Cichlids) but lowering is not.
All you need is:
So you have all but the last two.
Decorations depend on the fish, some need more of a hardscape, others prefer live plants. An air pump may be necessary if you do not have live plants, but you can often get away with having the canister output disturb the surface.