[Deinonych]

You want to minimize water transfer between tanks, but a little bit won't hurt. If you use a plastic colander or something similar to capture and move the fish, it will minimize water transfer. I personally use a Reef Gently Acclimate box with clean saltwater as a transfer container to "rinse" the fish before it goes into the transfer tank. I also try to use my hands to move the fish instead of a net.