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Looks like there might be detachment as shown by the missing growth patches, and also by the glob on the tray. Give everything a good brush in your sink, tray and slot included.
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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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