03-17-2012, 03:03 PM
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Glass Barb is a common name that I am not familiar with, and when I did a search it came up with various obviously-different barbs. Do you have the scientific name?
In the interim, all barb are feisty and active, so nipping can be expected. Maintaining the fish in large enough groups and tanks can lessen this--usually. Depending upoon the species, 6 may be normally sufficient, or more may work better.
Another point to make is that barb should never be combined with sedate fish like gourami, and I'm afraid you are seeing one reason why. Rainbows, assuming it is one of the larger species, should be OK, but I don't know the tank size nor the barb species.