I just wanted to mention, make sure the betta
has room at the surface to come up for air.
Bettas are labyrinth fish and must have access to air at all times.
He looks very nice. try to keep him a warm location as bettas
love warm water (think 80F)
Even better, grab a 5-10g tank for him, give him a filter, light,
and some plants, and some tetras to chase
Try to vary his diet. Frozen Bloodworms, Pellets, Shrimp Pellets, Flakes,
Spirulina Flakes etc. Bettas are very prone to constipation, so feeding the
same thing day after day can cause problems with their bowels.
Way to go on saving him! Hes gorgeous!