06-17-2011, 10:10 AM
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$4 a piece is about right. To get rid of an infestation, I would add 1-2 for every ten gallons of water. (assuming you have hard water).
You could always add more, let them multiply, and then sell them all when your anil problem is gone.
Oh, and in response to speed- I've seen assassins hanging around, and they're quite slow, but they're like a cheetah- when they want to "sprint" after some food, they can go quite fast.
And MR ed, if they multiply that fast, then you need to stop overfeeding your fish.