Heater failed
Not sure how long my 20 gallon tanks heater failed. Found out when I went to feed the fish, opened the lid and got hit with a bunch of humidity. I tested the temp at 92 degree f, 17 degrees above set levels. This brings me to a great discussion of what heater people use and steps people use to prevent this type of problems. This heater was a cheaper aquaneat 100w that was only about 4 months old.
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The hard part is running so many heaters on 1 power strip can start to tax the circuit and when you run multiple tanks it can add up pretty quick. There are a lot of great ideas when it comes to keeping an eye on heaters, running 2 undersized as well as having a one that monitors temperature. For some of the heater that I needed to replace I tried to look for titanium heaters that is for the tank size right now. But I did add a procedure to my daily tank maintenance which is write with erasable chalk marker the temp and use a temp probe to check the tanks daily to see if there are any changes to these temps.