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?
They are developing a pecking order, and someone has to be on the bottom. 5 is better than 2, but I think part of the problem is that you only have 5. Try adding a few more.
This species is more feisty than some tetra, and is prone to fin nip. As it matures it will develop these traits more.
A larger group (if tank size permits) may help. I would say no less than 8. But understand this may not do anything, the bully is still a bully but the more fish in the group the more spread out this will hopefully be.
It doesn't look like any fin nipping has taken place yet, but the bullying seems to be directed at a single fish.
I'll let the tank adjust to the new bio load for a week or so but keep an eye on them for now. If it gets too much, I may have to look at separating them somehow.
It has been a week now, and I noticed last night that all 5 fish seem to be swimming more like a school of fish all together. Even hiding together at some points of time.
They do spend time apart, but none of them seem to be isolated like they initially were, I think it was more that the original two were a tad territorial to start with.
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