I wouldnt mix meds in my opinion. Like you said it may be dangerous to the fish. I would suggest at least 2 weeks in the qt, thats what I plan on doing going forward. I'm also not going to preventative treat them with anything, if they show any signs of anything I will go from there
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.