Rory, I currently have a 230g, 190g, 44g, 24g and 12g tanks and I buy and pack all RODI water from a water store in town that I have worked with quite a bit and trust the way they treat their water. I do a minimum of 15% bi weekly water changes on all of them. It's a lot of work I guess but honestly I don't mind. Packing all that water has definately helped out my muscle tone!
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