I dont understand my calcium

fmelindy

Member
OK, my reef tank has been setup for about 6 months. I've got a crushed coral bed (I know it's not ideal). I first started adding corals (mostly LPS) around a month ago so figured I'd measure my calcium. Used the SeaTest chemical test and got a value well over 500. I figured that couldn't be right so I bought a Hagen chemical test kit. Result=580. Brought to my LFS and had tested and showed same value. I don't understand that. I haven't been adding calcium and my ph is lowish at 7.9. I figured I chould buffer the pH upward but the only way I could think of to do it is with kalkwasser and when I add more calcium with kalk it just precipitates out.
My questions are: is there such a thing as too high calcium? How should I buffer the pH upward at this point? Do I need to do anything about these levels? My hammer coral doesn't seem to be doing so well - it was fully opened and in the last two days has really shrivelled up. I don't know what else to do. Oh, BTW, my other parameters are:
Nitrates 20
Nitrites 0
Phosphates 0
Specific gravity 1.025
temp 80
Ammonium 0
kH 110
Thanks in advance for any advice you might offer!
 

col

Active Member
Yes, there is such a thing as too high calcium. It should be 400 - 450, so yours is well high.
What are you measuring KH with (dkh, mEq/L ???) A KH of 110 sounds impossible to me.
 

fmelindy

Member
sorry, I'm new to measuring kH. I just got a Hagen test kit and it says its in mg/L and it says that 105-125 is the normal range for marine kH (carbonate hardness). Like I said, that's new to me, so I really don;t know that much about it only what the kit is telling me. So the calcium is too high.... but what should I do about it?
 

greatfullreefer

Active Member
SeaTest and Hagen are famous for high readings. I tested my calc with hagen and it showed 600 wowsers. My calc is 420 so do yourself a faxour and get a salifert calc and an Alk test kit, they are the most accurate drip tests on the market. You will not regret it.
 
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