Odd behaviour from Barbs

Question

I have 6 tiger Barbs and 3 Green Barbs. 2 of them are behaving odd. they are hiding from the others and have rapid fin movement. This has been going on for quite some time now. They will sometimes mix with the others, are easting normally and there is no sign of them being attacked. both the fish are males. all the barbs are about 2 inches long and i've had them since November 07

Answer 1

I have at least twelve barbs:  tiger, yellow, albino and rosy.  They behave differently at different times.  Sometimes they're all flying around together and other times they're might be a couple that are loners, but they always return to a group eventually.  I wouldn't be worried.