Mmmmmm... doesn't strike me as nutrients. I know it was asked before and I might have missed the answer but how long are the lights on?
Brown doesn't just mean nutrients (My nitrates are at 10 ppm and I've got great colour). It can also mean stress (think of having extra zooxanthellae as stocking up on fat for a disaster). This could mean:
-Not enough light
-Not enough flow
-High temperatures or temperature fluctuation
-parameter fluctuations (in particular salinity and KH)
- Or they're simply just not in the right spot.
Have you tried moving them to a different location?
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