Any ideas what this stuff is? Reminds me of diatoms. Comes back within a day. Only in lit areas. Slimy and stringy on the wall and rocks. Bubbles on some of it. I’ve battled Dino’s. Cyano, you name it. Treated for cyano 4 months ago. Wiped clean. Now this crap. Torches have been retracted quite a bit. Nitrates 0, alk 8.0, calcium 400, phosphates .015ppm. Salinity 1.026. Magnesium 1400. Trying to get nitrates up a bit.