I do about 5 gallons changed every other week and have never gotten behind more than a week or so. Truthfully I havent checked my levels in about 3-4 weeks, because I used to check pretty much daily and never really had many problems, so I assumed everything was fine. Tropic marin is the salt. I don't have a fuge.

Hamp, where did you go to get a full range test done? I had a test done yesterday, but they didn't test for magnesium or strontium.