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Unread 10/27/2017, 09:50 PM   #3
dkeller_nc
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Join Date: Mar 2013
Location: Central NC
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If you'd like to use calcium acetate as a combination calcium supplement and carbon source to encourage denitrifying bacteria, there's no particular reason to purchase calcium acetate if it's expensive. You can simply combine vinegar and calcium hydroxide (kalkwasser) in the proper ratio, and viola - calcium acetate.

If what you mean by your post about a combination photosynthetic/anoxic refugium, that's actually pretty easy to accomplish - you simply use a 3 or 4 inch layer of sand in the refugium, and stock the water above the sand with macroalgae. The drawback to this sort of arrangement is maintenance - the sand will eventually become clogged with detritus, and one would pretty much have to completely disassemble the sump and start over when the sand layer became too clogged.


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