Okay, so my purple Betta has been moved from my 5 1/2 gallon back into his smaller 3 liter tank because he couldn't handle the filter and I don't have money to get a smaller filter at this time.
My question... His gills (underside of his face) seem to be swelled. This is the second time it's happened. The first time he was in the big tank and it went away after I turned the filter off. Now he's in his old 3 liter tank with no filter and it's happened again. I do water changes every other day on the little tanks/bowls and 50% on my bigger tanks every couple of days.
I've added aquarium salt to his water this morning but it doesn't seem to be helping.
Should I prepare for the worst, pray he makes it or buy some type of medicine?