So I have 1 hive that has had mite issues and some deformed wings. I have formic acid to use and will pull the supers and treat. Should I treat all the hives this year? Many are packages and swarms.

So plan is to use formic acid in a 60% solution. 30 ml into a shop rag in the jar on top 4 days x 3 treatments. Should I close up the SBB or leave it open.

Thanks for the advice in advance.