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Discussion Starter #1
I'm using RO water and it looks like I'm neglecting calcium when rebuilding my water. I'd rather add something I can measure to get the level to whatever it needs to be. Kent's liquid calcium and Seachem's reef calcium are sitting here in the house. Would either of these be suitable? If yes, what kind of dose/number of gallons would I want for freshwater? If not, what product would I want so I can measure the dose?
 

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I know some guys who were dosing Kent Turbo Calcium. I am not sure of the proportions.

I'll see if I can find out.

Mike
 

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Discussion Starter #4
Truthfully, I'm grasping at straws. I've got 1 tank that's giving me a bad time. I've been doing a lot of reading old stuff the last few days and based on the idea that any 1 nutrient missing can be a limiting factor in everything else working the way it should, I've been thinking about what is and isn't in my tank. I've been using the individual chemicals from Greg Watson instead of RO right lately and I didn't buy calcium from him. This means I haven't added any calcium at all for a few months now. I figured a minimum dose wouldn't hurt my tank and might help.

Edit: I don't know if the results are valid--I used a saltwater test kit. My calcium levels are below 20 ppm (as low as the kit would measure).
 

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Discussion Starter #5
Well, I found an interesting thread on calcium at APC http://www.aquaticplantcentral.com/...ys=0&postorder=asc&highlight=calcium&&start=0 .
Somebody had even asked how much of the Kent liquid calcium to dose--and I couldn't find the answer.

Kent itself has done one of my pet peeves--idiot dosing directions (both on the bottle and the website) rather than giving the concentrations and letting me decide for myself.

I found another post at wet thumb indicating a good level is between 15 and 75 and another poster who was very happy maintaining 40.

I know the kent liquid is 10% calcium.

Does anyone know how much per X gallons raises it y amount? Or know of a good reef forum where I can find out some sort of dosing proportion I can cut down?

Thanks
 

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I use the Kent Calcium. I add 3ml after 50% water changes on a 50g tank.

My suggestion is to add it very slowly until you get the desired GH.

I also add Epson Salt to keep magnesium at 5 ppm.
 

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Discussion Starter #8
Thank you mpb--that was exactly what I needed right now.

I'd been using RO right, but the stuff I have is one big lump and a PITA. So I started dosing using the Greg Watson stuff and (dumb me) forgot calcium. So I've got plenty of gh--but it's all magnesium. This should let me get back in balance and then I can stay that way in the future.

Thanks everyone for suggestions--I'm sure they'll be useful in the future.
 
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