Well this evening he is back to his normal self again flaring at me when I come by the tank and swimming around with his fins up. Looks like it was either the heater not being in the tank (however the heater hasn't really kicked on cause the temp has been close to 80 with the light on the tank on) or the shrimp stressing him out. Thanks to everyone who gave me input as Oscar appears to be back on his feet again.
