12-13-2011, 10:56 PM
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Personally I don't think those are good co-species. The Tiger Barb is an active semi-aggresive fish that can get about 2.5" each. They should probably be housed in a species only tank or with other semi-aggresive fish, they are also notorious fin nippers. Those rainbows will get 4" (Turquoise) and 5" (Australian) both are peacuful schooling fish that like lots of swimming room. The Blue Gourami's can also get up to 6", Gourami's moods will change as they get older if both are males they can get territorial. I have a single Blue Gourami, he's been in there for 3 years, through two major rescapes, and one major restocking. He started off as a fiesty little **** but now he is the most docile fish in the aquarium housed with rasbora, tetra, and emerald cat's.
I don't know much about the Rainbow fish but I wouldn't hosue Tiger Barbs with Gourami. Then again I'm no expert so you will probably be find leaving it as is, if you must add some bottom feeders (different opinions will tell you they either do or don't add to your "fish count") as mentioned above snails would work or you could try a small school of Cory's
Tiger Barbs are cool fish IMO, I'm planning on (hopefully sooner than later) setting up a larger 75-90 gallon tank and thought about doing a semi-aggressive planted with Tiger Barbs.