On our 3/4 acre pond we have what apears to be some sort of a slick over at least 1/3 of the pond. Could this be caused by no rain in over 2 months? 2 weeks ago I did treat algae with copper sulphate and there are a few very fine particles of the algae within the slick. Should I retreat or wait to see if rain would disbuse it? Pond is in La. and 12' deep. Thanks !