With almost no corals, you actually don't need to run a Ca reactor.
How often do you change out the media in your Phosphate remover? It may be "full" and NOT absorbing any more phosphates from your system.
How long are the lights on per day? Too long a photo-period + high powered lighting (400w) + not enough corals to compete = algae problems.
Is it hair algae or what that is the problem?
Any pics would be useful.
Anthony
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