thank you all..you know that discus live in 30 deg temp. so in this high temp most of the plants do not survive.the plants live in this temp is anubias sp,echinodorous sp,java moss,anacharis sp....the best way to survive those plants is keep your tank temp slowly high from 28 deg temp.like you keep 28 deg temp for 15 days then keep 28.5 deg for next 15 days like that.and the conventional rule say us that provide 2-3 watt per gallon of tank.also provide co2 diffuser and also give plant fertilizer....