My dragon scale betta is about a year and a half old. Shortly after I brought Rojo home he started developing a small white bump on his lower right side. It has never affected his behavior, he always ate, swam, made bubble nests, etc.
Over time the lump has gotten larger and larger. About two weeks ago there was something that looked like an open sore on his lump (a red spot that looked tender) I immediately cleaned out his tank and changed his filter, and also started feeding less.
The sore healed, but Rojo's behavior has been strange the last few days. The sore is solid on the right side but has just recently started poking through on his left side too.
His tank is a good temperature (2.5 gallons), has a fairly new filter in it, he is fed one pellet in the morning and one pellet at night.
Currently he is laying in the bottom corner of his tank a lot, he is having a hard time getting his food and sometimes when it looks like he is going to get air he stops just short of the surface of the water and lingers until it seems like an emergency to get a breath of air.
I will include as many pictures as I can. Rojo isn't that old so I want to do whatever I can to help him. I will be moving in a few short weeks too and I already know the stress is going to be a lot, so I want him in good condition before that happens.
Please help :( I have researched this problem so many times and I can't diagnose it with the amount of conflicting information I keep finding. :(
First picture is shortly after I brought him home. Second picture is the bump poking through on the left side. All the rest of the pictures are the large lump on his right side.