I think my fish has constipation but I am not sure. Recently I noticed that his stomach was a little bit larger than normal. I fasted him for two days and his stomach returned to a normal size.This has never happened before in the almost 3 months I have had him.
I don't know what is causing this. Here is a bit more information about him and his enviroment if it helps.
My tank is a 2.5 gallon. It is about 76-78 degrees fareinheight. There is no filter, air stone, or other aeration, but it is heated. My fish doesn't live with any tank mates.
I feed him Top Fin Color Enhancing Betta Pellets. I now feed him 2 pellets a day. Recently I started feeding him three a day, but he looked constipated so I switched back to 2.
I do a 25% water change about once a week. I don't put in any additives with the water, but it is spring water.I haven't tested his water recently.