Ive become a bit pedantic about acclimation and testing parameters of incoming livestock. I drip acclaimed over night, or over days, as part of my QT process; depending on species.
I use a tank or a bucket and have a heater and sponge filter to setup a good intro process before I dump livestock into any of my tanks. Ive not lost any fish or invert since implementing this process. In the case of adjusting incoming livestock to my conditions, including pH changes of more than 1.0, I'll do a multi-day drip cycle to adjust slowly and reduce shock. I use both tank water and RO and test religiously each day. Crazy, perhaps, but it works for me.
Sent while on the go...