Sorry probably should have listed those right off the bat:
12gal Eclipse (closer to 10gal water volume)
tested last Friday:
nitrate - under 5ppm
Phos - 0
tested last night:
dKh - 9-9.5 (hard to tell with the api kit)
Mag - 1360
I haven't finished the article yet, but there were a few things that really stood out to me that may point to the cause.
1. Calcareous algae has up to 4.4% Mg in its skeleton, most other corals are in the %0.1-%2 range.
If Halimeda falls into this category, I think it could be a cause.
2. The more Mg you have, the more Mg gets used.
I'm going to let my Mg drop to about 1350-1300 and see if that curbs the depletion any.
3.Just like Deckoz mentioned, lots of things use it, inverts, corals, even fish.
4. Mg supplements are extremely dilute.
This explains why it feels like I'm dumping buckets of the stuff into my tank, when everything else usually only takes a few drops...
Where are your calc and alk levels? How big is your tank? I use about the same -14ppm may a day. Over 7 days is 98ppm. Whoever said just do water changes. This is a drastic change in a week. And a 25% water change would only replace about 24.5ppm...dosing is needed as he is doing
Anything that builds a calcium skeleton uses mag. Including your inverts like snails clams ect. Some macros use mag and also magnesium effects your calcium supersaturation - alk affects this also. What's your other params?
Edited by godfathernikki, 14 March 2012 - 09:25 AM.