High magnesium

[DSC reef]

yes...but a TDS meter is only a estimate not a definitive reading. It will tell you the PPM of ionized solids. it wont tell you what it is. as far as I know SW test kits can be used for fresh, but not the other way around. The only reason I do it is because I used to get RODI water from a LFS and I was getting cyano. I did a PO4 check of the source water and found the reason. Now its just habit

This honestly just sounds like another store not changing filters, membranes and resin on time

 

[FishOfHex]

I just got my red sea magnesium test kit and tested my tank. It reads it at 1760! I just did a wc 2 days ago. I thought those numbers were extremely high so I tested again and got the same. The photo is of my other parameters because that's easier than typing it out. Mostly acceptable except my phosphorus is high and I do not have an iodine kit to check that yet. I did not check ph, ammonia, or nitrites because the tank is not newly cycling and I don't see a need for it. The first column is what I understand as an acceptable level and the hand written column is what I tested last night. Should I do anything about the high magnesium?

I have had issues with reef crystals and high mag levels several times. If you decide to keep using it make sure you mix the salt before adding it to your ro/di water and it wouldnt hurt to test the freshly mixed water to see what kind of mag lvl that box has. I had one box bring it up over 2000ppm and i ended up doing about 200gal worth of water changes in a month in an attempt to bring it down. If your snails are moving and sticking to the glass you should be ok if they are not moving thats a good indication that the mag level is to high. I did a quick video going into more detail and what salt i ended up switching to.