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It's a start, but I've seen RBPs breed in tanks w. just wood and sand; in planted tanks; and once in a tank w. fake plants and decorations. IMO, getting a group of 4-6 and letting them grow and pair off is the best way to go. Once they look like they're getting ready (very territorial, plump female), doing a big (50%+) with cool, soft water will probably get them going.

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We had our 5 for close to 3 years before any of them showed any signs of breeding. this is in a 140 gallon with about triple the filtration. keeping them well fed on nls and frozen fish (rare live fish being fed). we ended up with only one female and she prefers to build her nest in the centre of the tank. in the wild they will beat out a circle while doing their mating dance. Expect mass teetg scrapes and bites along the bodies of both fish. She becomes super aggressive (way more so then the male) and will "herd" the 3 other boys to the furthest side of the tank.

We have had no trouble breeding in our rock hard water. really we didnt even notice the first time the bred.. just noticed a bit of aggression after the fact. i think the eggs got swooped up by the filter. Second time we purposely culled the free swimmers because we didnt have the time or the tank space to raise baby piranhas.

jvision has it right from what piranha forun uk says. large cool water change coupled with little to no light usually does the trick if you have a pair. they may need a large amount of time to get comfortable enough to breed.

good luck

Amy

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