Slimy, brown maroon in colour

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I moved my 200 litre reef tank 2 months ago, due to building work. I also added another T8 white light (2 in total now) which work together with one blue light. Slowly but surely a slimmy brown maroon algae has been growing on glass and rocks. It comes off easily enough but is an aesthetic nusenece. What could be causing this algae growth? I have little in my tank at present (6 fish in total) and haven't added anything new either. I do 10% water changes weekly and salinity sits at 1.023 according to reefractometer. What should I test/do/eliminate to try get rid of algae?
 

jacquesb

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Hi Gemma - is this "algae" slimey?

It sounds more like either diatoms, or cyano bacteria.

If this is indeed cyano, the most common factors, are: water flow, and too high nutrient levels (particularly phosphates)....
 
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Ya, the algae is slimy. I have put another circulation pump in and have cut feeding down, so I will see how things go. Will this algae dissaper by itself when problem is found or must it be romoved by vacuuming? This stuff grows on my sand too, so it'll be a pain to remove. Will probably remove half the substrate as well.
 

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