I would do a sizeable pwc
and test again. If its still high do another one, maybe a bit more moderate. If after that one its over .25 I would wait a few hours and do it again. You're right, you don't wanna stress the fish in their current enviroment.
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.