Red Purple Slime Algae

[fishoholic]

When we had a smaller tank we used chemi-clean and it worked like a charm, however after awhile it would start to come back. We got use to adding chemi-clean (with no adverse affects to fish or corals) whenever the cyano showed up and it kept it in check. However on our 230g the chemi-clean didn't work at all.

Got some good advice from a LFS and started to add a magnesium supplement (Kent Marine Tech-M) to the tank, this helped a lot but there was still some floating around in the tank. Cut back our lights by two hours a day (every day, used to run 2pm-11pm now 4pm-11pm) and since we started doing this the cyano is pretty much gone.