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Sure sounds like nitrates or phospates or maybe your feeding it with to much additive. I agree that there is a natural cycle of algae involved but 6 months is too long. Alot of places have algae packages of snails, crabs, etc and I'm sure that would help but maybe try a different test kit for nitrates. I fought nitrates for a while before my DSB/REEF conversion when I was feeding my tangs alot of food to cure their HLLE and my nitrates dropped but my test kit still read 100-120ppm while they were actually around 30-40. They are now around 0 on a Hagen and .2 on a Salifert low level test kit. Do you have a heavy fish load? I also let algae grow on the back and right side of my tank. Not much there but I figure the snails need something.
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