the reason the GHA is in your over flow is from the short depth of water the light is so intense and the algae will grow faster witht he nutrients traveling throu the over flow at the top......
mine has the same. i just let it grow.
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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