08-05-2012, 10:12 PM
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Black Widows Isolating Another Black Widow
I've had 2 black widow tetras in my tank for about 3 weeks now just as the tank cycling has finished, this weekend I decided to increase the number to 5 of them, so I went out and bought 3 more of them, smaller than those in the tank already (diff store).
Over the last 24 hours, it seems as though the 2 original tetras are picking on 1 of the new tetras. I assume they are somewhat territorial and don't like the new ones invading their space, however this has only happened to 1 of them. The other 2 I added seem to have settled in & colour has returned.
Should I be worried that they have isolated one of them? What can I do to stop them harassing?