If you're spending $250/month on water changes, why not save yourself a few bucks in the long run and buy an RO/DI unit? You should be able to find one for under $200. Saves a lot of packing water around, plus you know what you're putting in your tank. Try testing the Sobey's water for nitrates (most nitrate kits will do both freshwater and saltwater). Also mix up some fresh saltwater (let it mix for 24 hours), and test nitrates in there.
LOL I just read your last reply as I'm typing the Quick Reply box...that's great you have your problem solved! When I'm at my wits end like that I double check test kits.
