Is this Diatoms or something else?

KeithR423

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My reef tank completed its cycle around 4 months ago, now I believe diatoms have invaded. I have brown patches on my glass that easily come off with a my mag float. It's a bare bottom tank so no issues with sand. The rock I purchased from Reef Cleaners is around 30% covered with the slimy brown stuff and is growing thick is some low float areas between the rocks. I can blow it off or use a toothbrush and it comes off and floats around so I can siphon it out or it some of it will go in my filter sock (which I'm changing daily right now). But the next day it seems like its back all over again. Is this just diatoms? Best course of action to get rid of this?

Salt 1.024, Ammonia 0, Nitrite 0, Nitrate 30, ph 8.2, Alk 9, temp 79, calcium 440, phosphate 0, no test kit for magnesium.
90 gallon bare bottom with sump with protein skimmer, filter sock, purigen, gfo.

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if its slimy looking and comes off in matts then its not diatoms its most likely cyano.... what do you use for flow?? and i would suck as much o f it up during water changes..
 
It feels slimy and comes off in just small flake pieces. I have 2 power heads facing each other on both ends of the tank in wave motion, I have 2 more powerheads on the back glass pointing forward to the front glass. I think I may need something on the bottom of the tank and there isn't much going on there.
 
To me it looks like its cyano, but looks can be deceiving .. diatoms feed on silicates, are you using RO/DI water by chance for water changes ?
 
Yes RO/DI water on everything. 0 TDS. This stuff looks brown during full spectrum and blue lights, under just UV lighting it looks redish.
 
What are your Phosphates at?? and do you ever go around blowing detritus from the tank during water changes?
 
phosphate 0 and yes I'm blowing the stuff off the rocks every other night as well as before water changes every 2 weeks (20%-30%) each time
 

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