Hi.
thanks for your quick response. The lights have been on probably too long in the last few months around about 10 hours a day. Results from the following tests you asked for are as follows.
pH=6.6, Ammonia=0, Nitrite=0, Nitrate=0, Phosphate=5 !
The tank size is about 190 litres, and stock is roughly Platys =4, Swordtail=8, plus 1 now large Plec which I have had since setting up. Any suggestions would be most appreciated, I know the maintenance has slipped over the last 6 months because of illness in the family so I need to get back on top of that. Is there anyway to get this off the rock backscene without damaging the tank?
Thanks
Alec