Damien,
Firstly, SPS are not to say difficult to keep, if your system is already matured, and you fully understand the needs. Answering your questions here does not grant you that, unfortunately. 2ndly, unless you're already successful in a normal sized reef tank, doing a nano may drive you crazy, since there's hardly any stability in a nano-tank. So when you try to do a nano-SPS, it's double-trouble unless you ready for it.
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Originally Posted by damien
1. wat is calcium reator?
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A piece of equipment that contains lots of calcium-based media. CO2 is injected into the cylinder which causes the Ca and CO3 ions to be released into the tank, which is what SPS corals need a lot of. But that's not all there is to it.
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Originally Posted by damien
2. atleast wat kind of protein skimmer is need?
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Most "good" skimmers are too big for a nano tank, which means you'll have to be very hardworking in your husbandry and water changes. See below in the sump question.
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Originally Posted by damien
3.wat is the cost for a chiller (suitable for 2 feet tank) and the cost for the electric bill!
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The smallest one in the market should set you back about RM700 I think, consumption might be about RM40-50 extra a month.
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Originally Posted by damien
4. is that a over flow sump is a must?
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If you had a sump, then you could place a protein skimmer in it and hide it from the main tank. In this case, you can try to get yourself a Weipro 2012 or even a Macro AS-150P. You can also have the Ca reactor in the cabinet as well. It's also a good idea for the purpose of increasing the overall water volume so the system is more stable. There are people with sumps larger than their display tanks.