Mmmmm-kay, I have been running my new Aquamedic turbofloat 1000 SL multi skimmer for 2 weeks, ammonia, nitrate, nitrite and phosphate 0, ph 8.3, KH 9, Calc 450, new t5- bulbs for 3 weeks. Blasting and scrubbing the red slime but it keeps coming back... Any ideas?