set up a drip, works wonders.
In a nutshell this is how it works:
Get a container that will hold a good amount of water (5 gallon bucket works for me), add the fish with the water in came in, maybe a little tank water if you need the extra volume. Take some airline tubing and some suction cups and fix one side in the tank and the other into the bucket. Now use one of those little thumbscrews that come for airline tubing (or just tie a loose knot) to make it where the water just drips. Start a syphon and water should be dripping from the tank into the bucket. If you tied a knot, you can tighten and loosen it to adjust the drip.
When the water gets high, discard some. Eventually you will have the fish in almost all tank water with little to no stress. I have to admit I have just floated "cheap" fish, but more delicate fish and expensive ones this is the only way to go. I have started trying to do it for all fish as out "floating" method is sometimes the equivalent of being pulled out of death valley and dropped on top of Mt. Everest.
