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In the pic, you can see there's some algea , so I'm guessing that you have a Phosphate\Nitrate problem going on. Since pulling out the sandbed, how have your water changes been going? RO/DI water?
If they were mine, I'd take care of the algea and more then likley dip in CoralRx. Another thing I don't like in the picture are the pimples and white spots. I've never had zoa pox (knock on furan) so I'm reluctant to make that call. Maybe someone with more experience with it can chime in here....

