Im using aquaforest mag test. I dont have many corals which is why its weird. Its balanced out now to be steady at around 13-1350. But i had a period where it was dropping down around 1150. Ive also had a LFS check it for me and it produced the same resultsHow much water do you have? Quick search says that salt starts at 1350 mg and I don't see any heavy mg consumers... How are you testing mg? It could be very high throwing off balance..