I ended up buying a colony. 11 females and 2 males (one alpha male) doesn't bother the smaller one. These are all mature fish and have been spawning for the guy for sometime.
I'm actually going to sell the lot, feel bad saying this but I'm finding them just too boring.
Sorry about yours Doug...I also know ofsomeone that has just a few and it works for them, but 99% of the time it doesn't. When you have a larger group the aggression is spread out a lot more.
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Chicki
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