my tank is a 30gal and the power head is a 270 - gph. So when I came home I put the fish in about 1/2 gallon pitcher(new not used) with the water from the bag. I then used air line to syphon water from my tank to the pitcher. I tied the line in a knot so it would drip and doubled the water. After the water doubled I'd empty out 1/2 and repeat. I did this 4 times. I think he is ok. He is looking better now.