have algae growing in bottom(brown)

If it looks like this, it's diatoms,

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Provided your ammonia is 0 and nitrite is almost 0 you can get some snails to eat it up for you. It will pass w/time also.
 
If it looks like this, it's cyanobacteria

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Siphon it off and try to figure out where the extra nutrients are coming from. Ex, overfeeding, not using R/O water, neglecting water changes or w/e.
 
Siphon it. I can't get that chit to exit my tank and it's 5 months old. Rodi water always too. Brand new t5s weak bioload.

I finally gave up and siphoning it off with each water change. It's slowly going away. I also do a 25% water change weekly on my tank too.
 
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