Am assembling equipment for my discus' new 75 gallon home, & I'm trying to decide if it's better to get one large heater or two mediums. I keep the water at 85 degree ( 15 to 20 degrees over ambient room temp. )
Dual fears are one large heater could cook them if it becomes stuck, but 2 heaters double the chance of equipment failure.
Presently I have an Aqueon 150 watt in their smaller home, but after 5 months the temp dial is meaningless: I had to play w/it to find a setting to maintain desired temp
& now check it 10x a day due to lack of trust. Eheim Jager seems to have a great reputation except customer service is sorry if there is a problem. In-line heaters scare me because there's no visible light for assurance, + it is an extra opportunity for a leak.
Many Thanks for your thoughts & advice!