miserable betta

Long story short my fish landed on the floor. I picked him up & I thought he was dead. I threw him in a bowl to flush him but then he started to move. He never recovered from his Fin Rot earlier this year. He looks miserable. I'm not sure if I should try to save him or just let him go.

Yesterday morning I noticed Ombré my crowntail had white dots in him, was hidding, rubbing up against things. I got ich med and got to of the stressors what I think caused it. (On Wed I got 3 new glofish. He was fine with the 2 I already had.) I know I need to raise the temp if the water, but my...