I have a 175 gallon system and am using a hygger hg102 heater. It’s kept the temp perfect for 4 weeks now but last night I noticed the temp dropped to 73. It’s not rising. There’s no error codes and the heater display is on like everything is working properly. I placed a smaller backup heater in and have it up to 75. Inspected the hygger and nothing seems off about it.
