Also should have added I have done now 3 200ltr water changes with my salinity lvl at 1.025-1.026, 0 nitrite , 0 ammonia, 0 nitrate, ph of 8.0, cal at 400ppm, kh at 270ish... using rain water with coral pro salt and phosphate at 0... dosing with iodine daily.. calcium 3 times a week and kh...