Xenia doesn't feed out of the water column it is strictly fed by photosynthesis. I think your Alk is way to high should be in the neighbourhood of 11 dKH. I would stop using buffer/Kalk and just use a good Calcium with no buffer, and measure your Alkalinity daily until it is down where it should be, THEN start with a balanced calcium suppliment like Kent Liquid reactor... Once I set my Ca and Alk levels where they should be the Kent stuff works like magic.
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