04-29-2019, 11:41 PM
When the DS18B20's go bad they can start jumping around, also check the wires where they go in the green screw terminal connector, a few weeks ago I was getting some crazy readings randomly and it turned out it was hanging by a thread on one of the wires. Look good until I pulled it. I think you might already have but adding a ground in the aquarium water can solve noise they can pickup as well.