about 3 weeks ago or so i posted a thread on on a film had laying on top of my tank. i was advised to do a PWC
and cut the the feedings a little. so i did. i did not notice a change so i took my fish net and tryed to scop out as much as i could. that seems to work wonders and i gor rid of it for a few days. then i noticed it coming back again, so i did another 10% PWC
and... nothing it has not effected the film at all.
what is this and what could cause such a nasty film?
thanks for your help