+1
A turkey baster is too big and you will dump too much chemical into the tank.
After dealing with one, I found more. They are very hardy creatures. they will live in freshwater dips, they will live for days without water, they will live in temp changes. they live on glass they live on a snail's a**. they live on Rocks, they live in Kalk.
Nuke them from orbit, it's the only way to be sure.