I set up my 180 and I bought a finnex 500w heater. It's controlled by my apex temp stays at 78° the heater has been in use for 2 months. I went to check my skimmer cup and happen to look at my heater and the plastic guard that came on the heater melted. Sent an email to the company no response yet. Do you think it would be fine if I took the guard off and used the heater I tested it in a bucket with my temp prob and it works just fine.