I have some brown algea froming on my plants only. It is not diatoms as they will not rub off. It is a 6 gallon marineland biowheel pillar aquarium with the stock led lighting. I run the lights for 7-8 hrs a day depending on when i get home for lunch to turn the lights on. I also dose flourish once a week. My ph is 7.6. I do weekly 50% water changes also. The tank has been up and running for seven months with no problems. This started to occur in the las two weeks. Thanks for any help. Here's one pic of what it looks like.
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