melafix is completely harmless in fresh water, you are talking about problems when people have used it with inverts dont get the two confused.
However i wouldnt use it on a regular basis, only if fins are tethered fish have been fighting etc
Cher shawn, have a great break, im sure it i'll all be sweat. Im off on the 24th but one of my workmates is house sitting, the main benefit of working in a LFS