About 2 months back, plants in my aquarium was doing really bad. glosso melts, moss that did not really take off started dying, other plants's growth just sort of stopped. that was the period where weather was rather hot here, at least 30C everyday. it didnt occur to me that water temperature was an important factor until someone suggested to be to fix a cooling fan that lowers water temperature by at least 1 or 2C. after 2 weeks, moss seems to take off now, plants pearl more. i do not have a temperature reading device, but i do feel that the water is cooler compared to without cooling fan. Anyone experienced problems with water temperature?