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Old 09-18-2012, 01:49 PM   #61
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So a circulation pump is better than a powerhead?
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Old 09-18-2012, 02:03 PM   #62
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For most uses, yes. Though the clever use of powerheads can create specific current types that circulation pumps cannot. I prefer circulation pumps, personally.
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Old 09-18-2012, 05:17 PM   #63
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What is the difference between sea salt and reef crystals?
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Old 09-18-2012, 06:54 PM   #64
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I can't say for sure, having only ever bought reef salt before, but I would guess that a product marketed as only sea salt would be pretty much that. Just sea salt. Those marketed for reefs contain sea salt, calcium, magnesium, yadda yadda yadda. All the trace elements needed by various corals and invertebrates.
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Old 09-19-2012, 01:40 PM   #65
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Can someone please fully explain the concept of "cured" rock? I'm little confused. Thanks.
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Old 09-19-2012, 01:45 PM   #66
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Ooh ooh, I know this one!
Live Rock can be either collected wild or aquacultured. Either way, it is shipped in bags with little to no water, and often ends up with a substantial portion of the living matter dying off. So when it is first put in a tank, it is "uncured". Once in a tank, the dying/dead matter decomposes and releases ammonia, yadda yadda nitrogen cycle yadda yadda. Once that is finished though, the remaining living matter grows and recolonizes the rest of the rock, and that is considered the curing process. So, once that is complete, it is cured.
So, in a nutshell, cured live rock should not contribute to nitrogenous wastes or impede the cycle. Uncured live rock can create a mini cycle and possibly contribute to livestock death.
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Old 09-19-2012, 02:27 PM   #67
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But adding dry base rock to a tank with livestock in it is safe right? The same thing with live rock that's been living in an established tank?
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Old 09-19-2012, 02:29 PM   #68
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Correct. If it's from an established tank and not out of the water for longer than say, a few hours, it should be fine. Dry rock has nothing to die off, so it's safe as well.
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Old 09-19-2012, 02:32 PM   #69
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If you add dry base rock to a tank with livestock, it will be fine. Rinse it really well in RO water and maybe give it a quick scrub to get some of the dust/loose stuff off. It will become live in time.

Moving live rock from tank to tank can be a little more tricky. A lot of times LR has dead matter on it, stuck in crevices/holes/etc. When you go in and take it out and dunk it in another tank, you can release a lot of that stuff and cause an ammonia spike. LR from one tank can also have algae spores, hydroids, flatworms and all sorts of other things you may not want to spread around. You should always rinse and scrub when moving rock and still pay very close attention to your levels. Scary stuff aside, if you take proper precautions, LR is fine to move from tank to tank.
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Old 09-19-2012, 02:38 PM   #70
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What Jimbo said. I was speaking only in terms of cured/uncured. He gave a much more thorough answer. Clearly I need more coffee.
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