I haven't gotten into flatworm identification in a while but they may be a photsynthtic species that you have, not affecting the sps coral, at least directly. I understand you may want to blame them as the culprit, as you can physically see them but as others have mentioned check your alkalinity. It is probably not the smoking gun either but it is surprising that you nor anyone that I at least noticed mentioned phosphate levels or a test as elevated levels are detrimental to the well being to corals. Good luck.
Dying SPS?
- Thread starter STiTCH87
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