Tanks been up about 3 weeks now, I do mix my own water using RO/DI and Red Sea Coral Pro salt mix to a specific gravity of 1.025-.026. Using Red Sea marine test kit my Params are: 8.2 pH, 8-9dkh, 0 ammonia, 0 nitrites, 0 nitrates. 0 Po4 using a Hanna checker I picked up Saturday and plan on upgrading to the Hanna checkers for everything else soon. I just replaced all bulbs yesterday as well which I believe to have been contributing to the problem as 2 were not performing correctly and I just noticed it, we're doing good then started seeing this and did some reading and started checking.