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Old 01-18-2007, 09:27 AM   #1
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Adding calcium?

I picked up some Calcium last night to add to my tank, hopefully to promote coraline growth and to help corals when I have some hard ones.

I was wondering how much I should add in right now? I have 25 lbs live rock, 125lbs base rock. 120 gallons. It's seachem calcium that says 1 capfull per 80L, so that would be about 6 capfulls? Sounds like a lot to me.
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Old 01-18-2007, 09:29 AM   #2
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Do you have a calcium test kit? You really need to know what the levels are now before dosing. If you don't have a calcium test kit, I would recommend a Salifert or Seachem one.
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Old 01-18-2007, 09:32 AM   #3
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Don't add any unless you have a test kit to monitor it.

Assuming you have a test kit what is your current Calcium level? 6 cap fulls is a lot if your Calcium is already at 380 ppm for example.

You want to get your level around 400-420 ppm.

Also I wouldn't add it directly to the tank. I add mine either when I do a pwc or mix it up with FW when I top off the tank.
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Old 01-18-2007, 09:32 AM   #4
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I use tap water and haven't added anything to my tank except IO salt. Could I just err on the safe side and add 2-3 capfulls a week or something?

I will need to find a test kit I guess
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Old 01-18-2007, 09:36 AM   #5
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No, it's very easy to overdose the tank which could be disastrous for your corals. Your Ca level is probably already around 400 due to the Ca in your salt mix.

Get a test kit before adding. Salifert is best IMO but I've also used AP with good results.

Also keep in mind that there are other levels that affect Ca like Alk & mg for example.
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Old 01-18-2007, 09:41 AM   #6
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Oh really? So, dosing calcium is totally useless then? I thought everyone needs to dose it.

What about when I switchover to Tropic Marin Salt?
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Old 01-18-2007, 09:42 AM   #7
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I would think that's a lot too - considering displacement of water by the 150 lbs of rock. You got maybe (and I'm TOTALLY guessing) 80 gallons of water.

On the liter:gallon conversion (80L = 15.85g), then considering 80g/15.85g=5, your dose would be about 5 capfuls. On the other hand, if you're doing regular water changes now, and you don't have any hard corals yet, I'd do even less than the 5 capfuls - or maybe consider not dosing at all for now. Especially without a test kit to know where you are anyway.
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Old 01-18-2007, 09:49 AM   #8
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Oh I see - so basically calcium dosing is not required until I actually have hard corals which suck the calcium out of the water, and then it will be required?

What about adding a bit to promote coraline growth?
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Old 01-18-2007, 10:01 AM   #9
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IMO, doing regular water changes will get you where you wanna be on the coraline - in the right time and safely. I've never done hards, but I'm not a fan of putting much of anything in the water. That's just my preference.

Also I've seen coraline gone wild. Not too pretty when it gets that abundant IMO. Some love it though.
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Old 01-18-2007, 10:06 AM   #10
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As stated before, don't dose anything until you have the proper test kit. I have found, regular PWCs will replenish the depleted elements. I imagine the only time you should dose with Ca is if your coral bioload is overloaded and they are using it up so fast that PWCs are not keeping up with it (personally, this would mean just do more PWCs to keep up with it).
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