What is this

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mgsr

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Can anyone tell me what this is grow on the botom of my tank all of a sudden just started to grow and only in one spot
 

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It is cyano bacteria. It is due to an excess of nutrients in your tank. Specifically your sandbed I reckon.
 
Back off on feeding and add water flow to the area ....................
 
Cyano isn't bad per say. You should remove it manually and then find out what the cause is.
 
I had a lot. I did a larger waterchange (30%), sucked out as much as I could and then changes to feeding once every two days, and lowered my light cycle from 9:30 to 4:00.
 

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