Diatoms

[clayton]

I have a 29 gallon with 2 sps colonies, 1 sps frag, and a kenya tree..it has a quad t5 light system with 2 atinics and 2 10,000k bulbs..its been running for over 6 months now and the diatoms have been present for 5 months..I used tap in the beginning but i have started using ro water for the past month (its the water from the machines at H-E-B) I am also running a bag of chemi-pure elite in my filter. I have also started using the microbacter 7. The diatoms completely cover my sandbed to the point it looks like a mixture of sand and dirt. I am just tired of looking at them and i thought they would have dicipated by now?I have ordered a sand sifting starfish but i am just waiting for its arrival. I am seriously considering getting a skimmer if this would help...Anyone have any advice on what i should do?