Review on 🐠 hygger Fully Submersible 500W/800W Aquarium Heater with External Temperature Display Controller: Upgraded Double Quartz Tubes Fish Tank Heater for 65-190 Gallon, Ideal for Marine and Freshwater Environments by Krystal Boyd

Pretty good heater. I put it on a 55 gallon tank last night. It was 69 degrees last night and 78 degrees this morning (right where I set it). I am also very satisfied with the outside temperature display. It lights up and is easy to see. This model uses a self-adhesive sticker to keep it in place. Most suction cups don't hold up that well. I think glue will work. I would recommend this heater.