I moved him from a 1/2 gallon with no heater to a 1.5 gallon w/ a heater a few days ago.
I am also doing more water changes.
He is starting to lay down a lot again like he did in the 1/2 gallon.
I have had him for a little over a year (walmart rescue), and he was always really active, then lately he started laying down alot so I got him the new tank and heater.
He still swims around, eats normally, etc...
But he has been laying on the bottom of the tank.
Not on his side, but like he is resting/sitting.
Could he just be getting old?