check your thermometer that temp is really high
if it is correct
I don't think the PH has anything to do with 88F Temp. Is there a glass cover on the top of your tank, between the water and your Lights?
Please monitor your heater many heaters calibrations are not the greatest and even though you set it to 78 it may come on at 87. Try adjusting the heater until it come on and verify the reading with your thermometer.
J |