10-14-2009, 12:43 PM
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The green spot algae will be a lack of phosphate, if you're in the UK I would buy TPN+ and dose 1.5ml a day and perform 50% water changes weekly.
Are you injecting CO2? With 2.5 WPG i would be dosing CO2, if you can i would also cut the light down to 15-20 watts, All plants can be grown at 1.5 WPG as long as CO2 and ferts are up to scratch.
Most red plants lack chlorophyll which is normally why they like lots of iron, magnesium and light! as well as the usual CO2 and NPK nutrients, and the traces also.
all Algae problems will come down to a lack in nutrients (NPK+traces), lack of CO2, lack of water movement or high levels of base line ammonia (common in new tanks)