polystyrene sheet, is it poisonous to fish?
I was just about to build my sump with some polystyrene that i got from work, however someone has just told me that it is poisonous to fish?
is this correct. the sheet is clear perspex, but is marked up as being polystyrene. apprently its the acrylic perspex that is safe for fish.
is this correct?
i really need advice on this fast.