I have my temp at 82F. The problem is that they just wont swim around much. Will it help at all if I lower the temp a bit?
Considering you say that they dont swim around much, are they mostly close to the top of your tank?? If so, thats an indication that your water temp IS too hot!!
Example: If you lived in Death Valley (Californian Dessert), would you go running around playing tag, or any sport in particular? NO, you just wanna chill and try to stay at a cooler spot.
Another thing is that they might just be stayin away from each others territorial spots. 3 established territory in a 55 gal wouldnt have enough room for another fish to swim around.