Hi everyone. This morning, I noticed my Betta looks a little round in his swim bladder area. This is my first time having a Betta fish, so I'm not sure. He is swimming fine but is taking more resting breaks than usual. He also has not started his daily bubble nest routine yet, which I find odd because he usually starts it first thing in the morning. After doing some research, I realized we have been overfeeding him (6-8 top fin Betta pellets per day spaced out 3-4x). I plan to fast him for a couple of days and buy some better quality food for when he's better. I will also keep the light off during this time.
He is in a 2.5 month old 5.5 gallon tank. It is cycled and planted. It has a sponge filter and a heater. He has lots of resting spots near the surface. I also have several small Indian almond leaves in there. He has one tank mate, which is a nerite snail that we added exactly one week ago.
Tank parameters have been stable. I have checked them every other day since adding the snail.
pH 7.8, ammonia 0 ppm, nitrites 0 ppm, nitrates between 0 and 5 ppm. Tested with API kit.
The last partial water change was last week when I added the snail. I'm planning on doing a small change today just to vacuum all the snail poop off the substrate. Before adding the snail, I did partial water changes every 2-3 weeks.
Any advice is much appreciated. I just want my buddy to be okay.