Rainbows fighting, Need help/solutions! - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 12-17-2010, 07:12 AM Thread Starter
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Rainbows fighting, Need help/solutions!

I have a few rainbows in my 55g. They are always very peaceful. Last night I noticed 2 of them were really going at each other. One is a New Guina Rainbow (red rainbow) and the other is a Banded Rainbow (Yellow rainbow). The New Guina was the more aggressive one of the 2. He/She was reall attacking the Yellow one on it's side right behind the gills. I've never seen this before. At first I didn't know which one what the instigator so I pulled the yellow one out and put him in another tank. Then the New guina went and started picking on one of the Bosmani Rainbows. So I put the yellow back and pulled the New Guina out and put him in a seperate tank by himself (time-out LOL).
Any Ideas what causes this? How can I stop it? I don't want to looes either one of them. Surely they are not trying to breed?!?!!?.......different species......can they?
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post #2 of 4 Old 12-17-2010, 07:32 AM
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I've never kept Rainbows so I don't know but someone else here will. How many Rainbows total, and what is the size of the tank they are being housed in? How is the tank "decorated", ie: plants, driftwood, etc.??

Duh, I'm a doofus. I just had a look at the tank under your aquariums tab. I see it's a 55, with rocks and driftwood. Nice tank. I didn't see listed how many Rainbows in the tank, just the list of species of fish you are keeping in that tank.

If you don't stand up for something you'll fall for anything...

Last edited by aunt kymmie; 12-17-2010 at 07:34 AM.
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post #3 of 4 Old 12-18-2010, 11:05 AM
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Rainbowfish are somewhat skittish unless kept in groups of 6+ of each species. While I'm not saying this is the problem, it is known that shoaling fish (those needing groups to feel "secure") frequently become aggressive on their own or in 2's or even 3's. You might want to consider removing (permanently) the two offenders, or alternatively adding more of each. But bear in mind their size and the tank volume.

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 you’re going to take it under your wing then you’re 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 4 Old 12-20-2010, 08:50 AM
most store bought larger bows are male. They will have a pecking order and I assume the initial fight you saw was someone trying to change status. You removed a fish which threw things off and is going to lead to more battles amongst the others. I would only work if it is one fish chasing another fish. If both parties are competing then let them be. My old boesemani boys got along 80% of the time except in the evening when it was time to recheck dominance. These fish WILL try to bite each other. Their shape makes this pretty ineffective. You basically have a bunch of bachelors in your tank and they behave similarly. I noticed a big difference between shop bred boesemani and locally bred hobbiest ones. I currently have 11 in a 55 and there is very minimal fighting. There is a high number of females though.

.... I'm probably drunk.

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