algae magnets

can you use any magnet for in side the tank use?

I think it needs to be sealed. There are some threads on TCMAS that Phil initiated on this very subject I think. Maybe he'll chime in.

Epoxy Coated magnets are the way to go unless you want to encase them yourself. I bought some regular Neodymium (SP?) magnets and encased them with epoxy into pop caps to mag magnetic rocks for the back wall of my tank. It worked pretty well but would have been easier with already coated magnets...