82 is fine. Telling the diff between too much water and too little is a little tricky. Initially, the leaves can show the same symptoms, groopy. Too much water though, and the leaves will start to grow brown/grey dead areas, that look a little like rot, too little water and the leaves will grow autumn brown and dry and brittle. I like to water enough so that the water is used up and the soil is dry 2 inches down within about 3 days.