kichimark
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Cut down on the light to reduce algae. In my experience aiptasia are fine with little to no light if they are fed. I have tons in my sump which has no light over it, just getting ambient light from room windows. Not enough light to grow algae, but full of aiptasia!
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When I volunteered as an aquarist at Long Beach Aquarium I would clean many of the exhibits in my section and many of them had TONS of aptasia in the overflows where there was no light. They were plain white but thriving in there from the constant food source. Some of the largest ones I have ever seen (around 2 inches diameter on the disc mouth) as well.