Refugium help!

75gal

New member
I made space in my sump, in design, for a refugium. I have rubble rock in there and I recently got some cheato for it. It's lit by a home depot led flood light (5500k) and all I grow in there is cyano/red slime. It has engulfed the macro Algae. Is this just a bad bulb color or is this fine?
 
Cyanobacteria and lack of flow can sometimes go hand in hand. Increasing this might help. (along with manual removal) GL.
 
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