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Old 08-05-2016, 12:15 PM   #11
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Limestone would be OK. My problem is any other compounds that might be added. Limestone gives a boost to your alkalinity in your tank.
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Old 08-05-2016, 07:07 PM   #12
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If I'm reading correctly (and guessing a lot), the limestone would be OK if just calcite while anything of dolomite would not be so useful (as magnesium isn't used much by saltwater corals?), but the limestone is probably going to be stable at the ph saltwater tanks are kept at(?).

If the limestone has copper, (also wondering on strontium), it might release back into system. So as saltwater tanks seem to require more stability might be better off getting carbonates specifically sold for saltwater tank - guessing again, is that anywhere near correct?
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Old 08-05-2016, 07:58 PM   #13
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Corals do use magnesium I currently dose 210ml of magnesium a day to keep my parameters stable !!! Magnesium is also important to stop precipitation of calcium and alk out of solution.

The risk of elements that could potentially leach from those rocks seems to much of a risk to take in a marine quarium as it's not like loosing say a £5 plant being a cheap one when a cheap coral will set you back £40.

Copper in a reef aquarium is a big no no it will kill your corals and inverts but is fine for FOWLR ( fish only with live rock )

Myself personally would use the correct rock so you know what's going into your tank I keep a full reef myself so speak from experience
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Old 08-06-2016, 05:52 AM   #14
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Corals do use magnesium I currently dose 210ml of magnesium a day to keep my parameters stable !!! Magnesium is also important to stop precipitation of calcium and alk out of solution.

The risk of elements that could potentially leach from those rocks seems to much of a risk to take in a marine quarium as it's not like loosing say a £5 plant being a cheap one when a cheap coral will set you back £40.

Copper in a reef aquarium is a big no no it will kill your corals and inverts but is fine for FOWLR ( fish only with live rock )

Myself personally would use the correct rock so you know what's going into your tank I keep a full reef myself so speak from experience


Would totally agree with this


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Old 08-06-2016, 07:52 AM   #15
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Thanks for your advice everyone

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Old 08-06-2016, 09:04 AM   #16
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Thanks as well - learnt something new. That is expensive on the coral! (that's about max price I have ever paid for a high-end plant).
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Old 08-06-2016, 02:25 PM   #17
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Thanks as well - learnt something new. That is expensive on the coral! (that's about max price I have ever paid for a high-end plant).
That's for a cheap coral some of mine are over £200 each !! And I would not want to gamble with them.
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Old 08-06-2016, 07:33 PM   #18
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That's for a cheap coral some of mine are over £200 each !! And I would not want to gamble with them.

Ouch! That's a good point.

Out of interest what level of magnesium do you maintain in a saltwater tank?
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Old 08-06-2016, 08:34 PM   #19
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I run mine at 1350
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