Ahh, in the future I would not do that. You should be ok for now cause its an invert and there shouldnt have been copper in the stores water BUT some stores run copper and if you pour their water in with yours you will have some serious problems.
Also, if there are any free floating parasites in their tanks you will introduce it to yours which is another not good thing.
Just scoop out the new critter and then add him. Corals and fish can be exposed to air for the time it takes to add them. The only thing you shouldnt expose to air are sponges....
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.