Neal,
Following up on some earlier threads, a water testing service would be interesting. I'd love it if there was somewhere I could go to pay 5-10 bucks and do some of the less-ordinary testing: phosphate, iodine, copper, iron, etc. I'd even do it myself. I wouldn't do it often, but once in a while it would be nice to get levels for reference. I won't spend the bucks for all those expensive test kits and colorimeters for my little reefs, but you'll likely need the "pro gear" for your setup anyway...
Just an idea. There may not be a valid business model there.
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