I have some stuff in my tank that looks like diatoms... When u look close though it is fuzzy... Like I can see it flowing in the current.... It gets little bubbles too after the lights have been on for a while.... It is only on the rocks and substrate and a tiny bit on the glass.... It is not slimy to touch, and has to be brushed off... Will not siphon away during water change unless it has been brushed loose first... I use RO
water for everything. Tank has been up about 1 1/2 months so I'm hoping its just the end of the cycle and will go away?