08-14-2008, 02:22 PM
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I've generally had good luck with them with most small community fish. I wouldn't mix them with slightly larger fishes like adult male blue or gold gourami's, but I've had no problems with most tetras, etc.
The price and "pairs vs single fish" bit seems to be somewhat based on location - in my area, alot of LFS sell individual apistos for about $10 - $15 each, and local breeders often sell pairs thru the local fish club for $10 - $25 per pair.
I've even seen nice pairs go for about $7 each at our auctions...