Went to start a water change today and when I lifted the top there is a huge bubble nest floating around some plants. The dwarf gourami that made it has been lurking around and under it since I noticed it. He is alone with no females, so there isn't any chance of babies. My questions are should I go ahead and do my scheduled water change? Should I be careful not to destroy it or will he rebuild it if he feels like it? Will it stress him if it gets destroyed? And does it being there mean that he feels safe and healthy, or will they do it eventually wherever they are and how they feel?