Toadstools not opening polyps since months

DEGREGORIIS

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HELP ! I don't get it. My water chemistry looks ok. All values(incl Strontium, iodide, etc) are within the limits, PO4 is 0.08 NO3 is 5 to 10, Salinity 34, etc. But my toadstool corals are not showing their polyps since months. So, my question: what could be the cause of it ? All comments are welcome as I will check them one by one. One say my lights are to intensive, other say my centropyge are bothering them ( but I have 5 BIG toadstools) and only 6 small CG's... My tank is 4 meter and I have about 30.000 L/hour water displacement. Total volume is 1500 L netto. Using A Deltec skimmer good for 3000 tanks. SPS and LPS do well, my Zoa and Paly's are not 100% neither.

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what kind of flow are they getting? I have my toadstool under high flow and he loves it. Thing about toadstools is I believe they shed a thin layer of skin every now and then and the flow helps blow it off as well as preventing detritus building up on it 20190618_112750.jpg 20190625_223537.jpg
 

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