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Originally Posted by ChizerBunoi
What do you think? Will this look tacky? My SPS will then be about 6" from the surface.
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Yeah, it probably will. If you don't have something laying around you could use (like a cheap Koralia that you can put the back magnet into the overflow) then just try the RO. Your SPS are fairly small still, so it may not be a flow issue. As they grow you're probably going to get some trouble. If you see a good deal on an MP40 I would probably pick it up if I were you and replace two of the MP10s with one MP40.
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I am going to buy a RODI unit from BRS. Just looking at the cost of RO in my city, it's going to be $40 just to do a 40 gallon water change. That's not including the ATO water of 15 gallons a week.
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Ouch. Yeah, that's a good plan. Talk to someone in your area that knows RO/DI systems really well to figure out which filters types work best. Here in Saskatoon we have chloramines to worry about, in Alberta I know many areas have really high iron content. I have no idea how that may or may not affect RO/DI systems. If you don't know a fish RO/DI expert, ask a drinking water company and just tell them you're looking at options for drinking water. They will tell you what you need for stages, and then buy it at BRS for 1/4 the price.
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I am thinking it was a combination of ALK ( initially at 7 and then I slowly raised it to 8), and bad water quality. Lesson learnt, listen to people's advice as they have been there, done that.
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I don't think it is the alkalinity. Tanks that run biopellets are prone to RTN if the alkalinity is above 8 dKH. Zeovit tanks are also supposed to run around 7 dKH. Natural seawater averages around 7 dKH. My reefs both run 7-8 dKH.