My puffers give me the most problems. I can't simply net them because it is a bit dangerous to take them out of water (they can inflate with air, which is bad) and they have teeth and will bite hands in the tank. I will chase one and the other will try and bite. So I have to carefully chase them around with a cup. I have only had to take them out three times, thankfully. When I switched their old tank from gravel to sand, when I upgraded their tank, and when I moved. And I'm about to have to do it again bc I am moving. Took me about 10-15 minutes each. And I have been bitten a couple times.