Bests & Worsts Reviews from Amazon

Killed all my shrimp, wanted to downgrade my heater to something smaller I could hide. Decided to get this one, 78F is only 1 degree higher than I usually run. Put the heater in, all was fine for the first night but in the morning everything had died, checked the temp it was around 85F, all my plants were ok but all the shrimp died.... dunno how this thing could go 7F+ out of range but since it can’t be adjusted i have no use for something that hot and inaccurate....