I've been trying to keep my 12g NanoCube at a steady temp for some time only to find out that the digital thermometer (Coralife) was off. II put 3 of them (Coralife digitals) in my 20g and the regular thermometer in that tank reads 78.8, the one from my 12g NanoCube read 75.5 and another one I had in my salt mix container read 79.8 and I put all 3 probes in the same exact spot. So now I don't trust them at all. I switched to digital because I had the same issue with the glass ones. Are there digital thermometers that are more accurate/trustworthy? Now I"m not sure what the temps are in any of my tanks.