Those strip thermometers are not good at all, except maybe for a trend. If you set & measure the actual temp with a "real" thermometer, then note where that color change stripe is at .... you can get an idea that the temp is off if that strip is way off the original mark. <Don't worry about the numbers or anything else on the strip, it is so inaccurate as to be meaningless.>
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.