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Old 05-28-2019, 02:56 PM
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Dosing - Trying to raise Alk and Calcium

Have a Red Sea reefer about 125 gals including sump, less minus rocks and 3-4 inch sandbed. Have the common problem of trying to raise alkalinity and calcium to desired levels: 9dkh, 450 calcium. I hover around 5 -6.3 dkh and mid 300's calcium. Magnesium approx. 1200-1260. Trying to raise mag too a bit. Attached how I dose by hand every 10 days to 2 weeks approx. The more I dose the worse it is to raise levels. When I dose alk now I get white flakey precip that takes time to dissolve. Corals surprising doing great..SPS, LPS etc. all good. just battling a hair algae prob with NoPox and slowly reducing. Not concerned. Thanks for any thoughts.
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Old 05-28-2019, 03:16 PM
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Charley which brand Alk and Cal are you using?
Your corals will do ok at those levels for the time being the issue will be raising it. You really need to go slow.
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Old 05-28-2019, 03:21 PM
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Forgot to mention.... ESV. Thanks!

Last edited by Charley; 05-28-2019 at 03:24 PM..
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Old 05-28-2019, 03:30 PM
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What salt are you using and how often are you doing the water changes? Do you have an apex? if so it may be time to invest in a doser or calcium reactor.
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Old 05-28-2019, 03:34 PM
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I would start off by dosing 10-15 ml each day added to your sump. See how much that brings your alk up each day. You really don't wanna move more then .5 dkh a day max with sps.
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Old 05-28-2019, 03:35 PM
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Use Red Sea Pro. Only do a water change every 3-4 mos. If I have to do more, I would rather leave the hobby. I did do a water change and did not move the needle on the alk and calcium. Was hoping it would as much as I hate it. No Apex yet, but I might in the next month....

Last edited by Charley; 05-28-2019 at 03:50 PM..
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Old 05-28-2019, 03:52 PM
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Thanks Joe, was considering dosing a little everyday. Just concerned I will miss some days until I finally get a doser.
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Old 05-28-2019, 04:56 PM
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Here is a link to a reef calculator to slowly bring levels to where you want them. Have you tried using kalkweiser in your top off water. That is a pretty easy way of keeping alk and Calc pretty stable especially if you have an auto top off system and your tank isn’t using a ton of alk and Calc.
http://reef.diesyst.com/chemcalc/chemcalc.html
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Old 05-28-2019, 05:18 PM
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Thanks so much grsfish. Have not use Kal as of yet. Thought magnesium would more or less play the same role keeping alk and calc stable? Is there a way to save the calculator on the pc?
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Old 05-28-2019, 05:47 PM
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Charley the problem is as things grow your consumption rate of elements, alk,cal, mag etc....increases and your not able to keep your desired #s because of the infrequent dosing. As mentioned a large dose every few days is asking for trouble.... smaller doses everyday is more desired to keep stability. An auto doser or cal reactor is the way to go with keeping SPS. Also check the #s on new water because a large change will throw #s off causing problems as well. That calculator works great for small dosing...been using it for many years.


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