The atoll grows. Had an eel escape to the sump and stir up the mulm. Been vacuuming the sump over two weeks. Finally caught the eel. The escape took my levels from 20 no3 and .2 po4 to 50 no3 and 1-.5 po4. Mag dropped to 1100. Had to dose 1800 ml mag to bring it back to 1365. Phosguard to reduce po4 from there to .50-.25. Added white vinegar to kalk for bacteria and take no3 to covert it into more of a meal for coral and clams. Somehow the cal dropped from 420 to 390 over night after the phosguard kicked in. Likely coralline growth but clams and sps could also be culprits as po4 inhibition levels are reduced. Making a batch of calcium chloride to dose over 2 days and bring it back up. Only use chemistry and nature here.