Aipetasia has reached plague conditions

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Personally I would use some KALK paste and a syringe. Works wonders and it is only 25 cents for a syringe at your local drug store and Kalk is also cheap.

Mix some KALK in little bit of water so you can suck it into the syringe. Turn off all your pumps so you have a calm tank, and start sticking each beast and inject some kalk, then squirt some on top of it and leave it. Do a bunch and let them stand in a calm tank for 15 minutes. Turn on your pumps, kalk will start lifting off rocks, but this process has always worked for me. Killing them in one dose.

Good luck!

EDIT: If you have hundreds of them, don't kalk them all at once... I would do 20 or so a day, so the Kalk doesn't through your water param's out of whack.