I have a quick question. The water needs to be changed in my tank, its a 1.5 gallon and I have been putting the water change because of the bubble nest my fish has made. He hasn't made a bubble next since October so I really hate to mess it up. I know he can make another one, but I was wondering if there is a way that the nest could be saved and to do a 100% water change, or even a 90% water change? I guess it is a silly question and maybe I should just change the water and not worry about the nest, but he's worked so hard on it.