05-11-2010, 04:26 PM
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Unless they are showing signs of illness, such as not eating, trouble swimming, being lethargic, etc. I wouldn't worry about them. They might all be females and can be getting full of eggs, that won't pose a problem or they are just chubby and love eating. As for the one tetra that strays away from the group. There probably isn't anything wrong with him. I have one black phantom tetra that swims on his own and then rejoins his group. Maybe he/she's more of an independent fish :) Sometimes fish will fight for dominance in their school and when one loses a fight he/she will wonder off for a bit and mope, then they usually join the group again as a subordinate member of the school. So again, watch for signs of illness, but otherwise, I think you just have happy healthy fish.