He doesn't look bloated. If anything he looks a little skinnier than normal. He had also been shedding his skin a lot lately. I don't know if that's related or not. I checked my water and everything seems fine except that the water hardness is at about 150 ppm. I feed my frogs a variety of things to try to avoid a poor diet. Tubifex worms, blood worms, meal worms, and occasionally beef heart.

I found this on a website:
Stroke: This is when blood flow to the brain is decreased due to a blocked vessel or burst small vessel. Symptoms of this may include Lethargic behaviour, not eating, unable to move back or front legs/arms, continuous trembling of a limb or unable to regulate balance in the water. Strokes can caused by stress caused by handling or movement of the tank, they can also be caused by feeding too much fatty foods like bacon fat etc., and temperature fluctuations can also be a cause.
This seems to describe him pretty well. If this is what is wrong, is there anything I can do?