Black Widows Isolating Another Black Widow - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 5 Old 08-05-2012, 10:12 PM Thread Starter
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?
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post #2 of 5 Old 08-06-2012, 06:05 AM
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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.

125 - BGK, chanchito cichlid, pictus cats, silver dollars, palmas bichir
125 - cichlids (severums, bolivian rams, chocolate), rainbows ( turquoise, red), loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, tiretrack eel, pearl gouramis, betta
90 - Congo tetras, african knife, upside down cats, spotted ctenopoma, kribensis, delhezzi bichir
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post #3 of 5 Old 08-06-2012, 11:51 AM
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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.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #4 of 5 Old 08-06-2012, 09:28 PM Thread Starter
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.
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post #5 of 5 Old 08-12-2012, 08:13 PM Thread Starter
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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