Has anyone had experience with the Tetratec PF500 filter and the compatible HC200 Heating Capsule? I am considering this for a 55g baby ray tank I'm planning since I don't want an in-tank heater for that little beastie. 

Tetratec filters are garbage.I would reccomend an aquaclear110.They are one of the few hanging filters that can actually pump as much water as they claim.