Is it possible that this macro algae is causing this black looks like diatoms, to grow on my glass. I never get brown or green algae to grow. Also the sand will turns brown within 24 hours of being stirred up. If I don't stir up sand it will start to clump within a couple of days. Tank numbers are phosphate 0.04, nitrate 0. Mag 1250 Alk 8 dkh, cal 460. Temp 78. Lighting Chinese black box's run blues at 80% whites at 10%.