Are these snails

[eric]

Are these snails? From the other side, it's hard to see, but no visible shell. Certainly act like snails cleaning the glass - moving in the direction of the round end. The split "tail" is not like the turbos I've put in the tank.

[C.Mydas]

nope, flat worms

[Tim Marvin]

Those are flatworms, but completely harmless. The red/copper colored ones are of interest to us. Don't worry about the clear ones.