Im in for one. Came home after traveling for 8 days to dinos and bottomed out phosphate and a big drop in nitrates. This is the second time this has happened despite dosing N/P and giving my son a feeding regiment (he missed 2 days). More than happy to pay the $650-700 to just adjust my DOS to add nitrate/phosphate or yell at my son to feed the fish. I can clear the dinos in 3 days but it takes everything a month or so to fully recover....plus lost a couple frags...fortunately nothing high end. The Hanna's are great, but dont do me much good when I'm out of town.