Your algae is eating up all the nutrients before you corals. I would wash your hands and arm really good, and start manually harvesting all the algae out of the tank.
There is no algae to harvest lol.. its litterally film algae on the glass and rock.. and the hair algae thats actually there is millimeters in size.. and gets mowed down to a white rock in a day or two by my snails and urchins.
Also im on day 3 of putting in magnesium... ive put in sbout 300ml of solutiin so far and i noticed ny mag will go up.. thrn boom drops back down in under 24 hrs.
Does magnesium get used up THAT fast ?
This is frustrating.. i think tidsy ima do a 30 or 50% water change with reef crystals.. clearly whatever im doing idnt working. Msintaining alk at 9 the corals are getting worse snd worse. Even sps corals that never were affected are shoeiwing signs the last 2 days.