Sorry for taking so long to reply, family issues prevented me getting on here. After 24 hours of the heater being unplugged (because turning it down did nothing) the temp was still the same, which was odd, so I took it out, and as I lifted it up the bottom half of the glass came away! So, I am presuming that smaegol's feet were clamped because they had touched the heater and been burned. It's the only theory I can come up with because since the heater has been out his feet are staying open. They still look injured, a missing claw and bent toes, which again makes me think he got burnt. He seems much happier now, back on the bottom most of the time and feet nice and open, I'm just going to give him time to fully heal now, and keep up extra vigilance with the water quality. The temp is staying between 71-73 F with out a heater in the tank. This is him now: