09-03-2012, 05:40 PM
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I agree. This tank, a 33g (125 liters) is overcrowded now, and fish need to be removed. The Tiger Barb are nippy fish and while having a dozen in this tank on their own would be the only way to reduce this, the other fish would all have to go; so remove the Tigers.
As for the rest, they are going to need more space, the Golden Barb attain 3 inches and would be better in a 4-foot tank.
Don't know what the "black tetra" may be, but if it is the Black Widow Tetra it too is nippy in small n umbers, and not good with gourami. If a black neon, they need more numbers. All tetra, barb, corys are shoaling fish that need a group.
The red tailed shark will likely be trouble one day, as explained in the profile, and it too will need more space.
Please have a read of our profiles, all these fish are included. Shaded names means you can click those for that fish's profile.