Yes. If there are ich parasites swimming around in it that haven't yet attached to your fish, you'd do better pitching them out. Agreed, not as bad as letting them into your DT, but I still wouldn't. Safest way to transfer a fish without a net is a small plastic kitchen colander (bowl with holes.) Water goes through, fish doesn't, and you just slip him gently into the water. ALWAYS put the stopper in your drain when working with the bag.