Well for my 2 cents worth I have a small reef system 30G and was plagued with the red slime algae for months, I tried a lot of methods but it always came back. I added plants (to get nitrate down as that was recommended nitrates dropped but slime disn't)
Then I decided to get CPR overflow and put a 10Gal sump under the tank, and withing a day the slime gone.
Jim
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