Hey all, I have quite a few frags in my 40B, so I decided it was probably time to check calcium magnesium and alk consistently now. I used the Red Sea test kit and found out my magnesium was pretty low. I went to Petco and bought fluval magnesium, and then I proceded to dose a small amount and re-test. I was dosing about 5 ml at a time, and I wasn't noticing a difference. I did some research and figured out I had to dose a ton! So I ended up dosing a tad more than a third of the bottle to raise my MG by 80 ( I read that you don't want to raise it by more than 100 a day ). So my question is, is there a more cost effective product to dose with? At this point I feel like the cost of salt from more water changes would be more cost effective than dosing this fluval MG lol