General Reef Discussion
Ok, so my tank is 1.5 years old. I do pretty regular weekly/bi-weekly 10% water changes. My calcium is 440 and alk is 9. Ph is 8.2 and mag is around 1440 or so. Phosphates, nitrates, ammonia, etc... are all undetectable. I scrub this stuff off and the next day it's back just as thick.
I run a...