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trenac · 03-11-2007, 10:22 AM

Sounds like Green Spot algae to me, it may appear to be black. This is usually brought on by a lack of phosphates. Also make sure that your C02 is at 30ppm with that much light. If you are going to use the EI method then you need to make the weekly 50% water changes required for this method.

03-11-2007, 10:22 AM	#2 (permalink)
trenac Senior Member Join Date: Jul 2004 Location: North Carolina Posts: 7,463 iTrader Ratings: 25 iTrader Positive Rating: 100% Plant Points: 179973	Sounds like Green Spot algae to me, it may appear to be black. This is usually brought on by a lack of phosphates. Also make sure that your C02 is at 30ppm with that much light. If you are going to use the EI method then you need to make the weekly 50% water changes required for this method.