brown diatom

Hello everyone. I am currently dealing with a problem with my 48 gallon tank. The tank has been cycled for about 3 months now. I have 3 clownfish, 1 anemone, 1 mushroom and 2 acros....Since last week, my tank has been filling up with brown algae and i cannot get it to stop overtaking the tank...

Hello, My tank has just finished its cycling period and has perfect parameters to start putting fish in but I just noticed this brown diatom forming. What do I do now? New to this hobby and am posting this so I can learn from you guys! Thanks in advance.

I've faced this before and quite honestly didn't exactly pin down the problem. Basically I am getting a brown diatom on my sandbed and it's actually becoming somewhat solid in places. Alk=8.0, Cal=420, and Mag=usually at 1350. I don't overfeed (feed the fish not the tank) but I do feed corals...