Hi, since I find answers to so many questions in various forums, I went looking for betta forums and wound up here. I have been a "betta mom" for about 8 months. I have a beautiful red betta, Little Red and a blue betta, Blue Boy. Imaginative names. lol. I have them in individual bowls, about 1/2 gallons with aquarium gravel on the bottom. They get clean bowls and water weekly. Here is the problem. Red makes beautiful white bubble nests and his home stays clean. Blue looks like he has a distended stomach and a couple days after cleaning his bowl and putting in clean water, there is a nasty scum on top. I checked with my pet store and found that I have been overfeeding and uneaten food was causing the scum. I started feeding once a day as she suggested. Red's bowl stays nice and clean, Blue's is showing scum a day or so after changing water. Also, sometimes he makes somewhat of a bubble nest but nothing like Red's. They both act fine, coming to the top of the water when they see food coming down to them. Blue not quite as friendly as Red. I wonder if he is sick although he doesn't act sick. Any suggestions? In the meantime, I will start to read the posts.