My 40g reef has had a problem keeping magnesium levels up, they tend to drop about 150ppm per week. About two months ago I had low calcium so I got a magnesium test kit, found out that that was probably the problem. It was about 1170 on 5/11 raised it to about 13-1350 then was back at 1170 on 5/21, raised it agian. I moved my tank about a month ago, 50% water change was at 1250 or so after but I had no magnesium sulphate so it stayed there for 2 weeks along with 380 Ca. About a week and a half ago I raised it to 1500 by accident, should have done a half way check but no ill efects, and now its back to 1350, right where I want it. And Ca has been at a steady 450ish since I raised the Mg to 1500.
So Im just curious does magnesium really deplete that fast? I have several frags and one 2-3" colony of sps that grow semi slow but have good coloration, and 3 small colonies and a few frags of acans.
The rest of my parameters are pretty good as of a few min ago with API test kit:
Ca-450
Kh-7.5 (just added b ionic to raise .5 DKh going to get it up to 9-10)
NO3-10
PO4- 0 but really who knows?
I have zero algae so I think the phosphate reactor is keeping that at 0. I'm planing on getting new test kits but with no algae, feeding 2 times a day and everything looking pretty good and some growth I dont think i have a nutrient problem at all. Also my Mg test is salifert so I know its reliable.
Im really just curious if Mg use is that high, I dose about 7ml of b ionic a day, probably need to dose more, and if my Mg keeps dropping like this then Ill need to add about 3-4 oz a week of magnesium sulphate which I just think is a lot
Thanks for any input
So Im just curious does magnesium really deplete that fast? I have several frags and one 2-3" colony of sps that grow semi slow but have good coloration, and 3 small colonies and a few frags of acans.
The rest of my parameters are pretty good as of a few min ago with API test kit:
Ca-450
Kh-7.5 (just added b ionic to raise .5 DKh going to get it up to 9-10)
NO3-10
PO4- 0 but really who knows?
I have zero algae so I think the phosphate reactor is keeping that at 0. I'm planing on getting new test kits but with no algae, feeding 2 times a day and everything looking pretty good and some growth I dont think i have a nutrient problem at all. Also my Mg test is salifert so I know its reliable.
Im really just curious if Mg use is that high, I dose about 7ml of b ionic a day, probably need to dose more, and if my Mg keeps dropping like this then Ill need to add about 3-4 oz a week of magnesium sulphate which I just think is a lot
Thanks for any input