hair algae
I agree with most of what u say
As far as the lights that depend on what is in the tank
If it is a reef or planted tank u r going to need about 10 hour per day. Depending on the light wattage and the live stock that needs it
As far as a fish only tank, the light is more for u then the fish, % hour is fine. If u r near a window even less
Always try to stay clear of direct sunlight. Over stocking and overfeeding r big factors.
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