Phyl said:Diatoms will burn out unless you replace them through water changes. Is your source water/salt free of silicates? There is commercially available silicate remover. Diatoms are a dusty brown algae. Not usually able to smother. Dinoflagelletes are also silicate fed. This is a stringy snotty looking algae with bubbles so that the strands tend to float. Cyano is fed by PO4 and possibly encouraged by bulbs that have shifted to the wrong color spectrum like PC bulbs.
I wouldn't encourage soft cycle without a stong understanding of saltwater aquarium keeping.
Been battling something for about 3 or 4 months now. It is either diatoms, cyano, or both. I'm really not sure. One thing interesting is that I tried the Phosguard( I believe) stuff that takes out silicates also and it went away for 3 days immediately and then came back? LOL