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Old 10-30-2005, 01:40 AM   #16
capman
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Hmmm... this all makes sense. My understanding is that Mg interferes with abiotic precipitation of calcium carbonate, which would explain why low Mg levels would make it hard for you to raise Ca and alkalinity.

I wonder whether Mg levels indirectly affect buffering of pH? I need to check my calcium and alakalinity tomorrow, and get an Mg test kit and check that out soon as well. Maybe this has something to do with why I have been having a chronic problem with pH going too high in the afternoon? (I guess I need to read up on these topics better).
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Old 10-30-2005, 02:47 AM   #17
Graham
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Depending on what corals you keep, phyto-based food are not usually the best food choice. They're more for microfauna (pods, tubeworms, etc). Most of the corals we keep want something of animal or bacterial origin....

Another thing to add along with vertical's recipe is that it's often much cheaper to get your own fresh seafood and make your mix mostly from scratch. The only "fish foods" I add are Mysis and cyclopeeze.

I get a couple fresh clams, oysters, shrimp, a small piece of squid, a small fillet of a red-meat ocean fish and soak it all in RO water for 20 minutes, and repeat with new RO a couple more times. Even fresh seafood is lightly preserved - and I hear there's phosphate in the common preservatives used. When done soaking, I put it all in (the old) Cuisinart and blend until it's edible-sized. Then I add a large pack of PE mysis, some nori and dulse (seaweeds) and about a 4"x4" chunk of cyclopeeze. Spread it thin into ziplock freezer bags and freeze it.

I spent about $25 total and I'm on the last bag of a batch I made in Spetember of 2003! It doesn't get freezer burned if you pack it well and use quart or smaller bags - that way any one bag isn't open for more than 6 months or so...

This has become the only food other than straight mysis that my fish will readily eat.
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