GHA

Lots.

what are your nitrate and phosphate at? Do you have any herbivorous fish in the tank? What does your filter currently contain? What’s your cuc?
 
So Im starting to get 1cm long greenish hair algae on my rocks. Are there any ways to remove it? wc, reactor, inverts, fish?
Its generally caused by raised phosphate which it can use as a food source

Because if this you will often get zero phosphate readings when you test

Look into phosphate removal methods, personally I use rowaphos and a good target is less than 0.03
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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