Here is something I posted on the Reef Chemistry page. What do you guys think of this.
So its been two months and I can't get rid of, or at least control, the algea growth on the sandbed of my 75g. This phenomenon happened during the first week of the tank and I was told that it was diatom algea, but its been two months already. I am having to shift the sand almost daily otherwise it forms a thick layer over the sandbed.
Substrate & Rock:
The sandbed(35lbs) is composed of very fine argonite and salt sized argonite with crushed coral that looks like beach sand. I have also noticed greyish areas below the sandbed. I have about 30lbs of base rock and about 15 lbs of live rock. Note 8 of the 15lbs was just put in on tuesday(7/13)
Livestock:
I have a cleaner shrimp, 2 camel(dancing) shrimp, 5 hermits, 1 domino damsel, 1 blue damsel, 1 false percula, 1 gramma, a mushroom polyp, and a galaxy coral, 10 aptisia buds(lol), and a small clam(scallop) that came with the live rock. I have also noticed pods, they look like small centipedes. Oh, almost forgot I also have a turbo snail that cleans the algea on the glass pretty good but won't eat the red stuff on the sand once its too thick.
Feeding and Parameters:
I usually feed 2 times a day; pellets in the morning and mysis or brine in the evening. The parameters; Ammonia 0, Nitrites and Nitrates 0, PH 8.4, SG 1.025, and Temp 78-80F. I also have a 30g sump that has no refugium yet, and a Berlin skimmer that produces significant gunk after 2.5 weeks.
Conclusion
My sandbed just looks bad and I am shifting the sand often, which I believe is not normal. It may be that the skimmer is just a bad one too since it is producing stuff every two and a half weeks.
People responded back saying that I was feeding too much, that I do not have enough live rock, and to add magnesium. So what do you guys think may be the problem.