ahh, not the most reliable testing equipment. i think your fist step if youre gonna keep such cool fish is to invest in your own kit. It sounds like a lot but for about $20 its a great investment. You can check your water yourself and reliably too.
How big is the tank you have the tang in usually and how big is your qt? Is there any improvement in the fish yet?
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.