Tropical Fish Keeping - Aquarium fish care and resources

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itsonlybarney 08-05-2012 10:12 PM

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?

jaysee 08-06-2012 06:05 AM

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.

Byron 08-06-2012 11:51 AM

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.


itsonlybarney 08-06-2012 09:28 PM

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.

itsonlybarney 08-12-2012 08:13 PM

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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