Should I add another heater to take the load off the existing heaters and by doing so will this reduce my monthly electrical bill? I have a bare substrate 240G acrylic 96x24x24 freshwater 1x arow jar @ 14" and 15 x clown loaches @ 2.5"-4" set at 80.2-80.5F using 2x hydor ETH 300w heaters plumbed via 2x eheim 2028 supplemented by 2 x 2217 eheims. Temps monitored using several digital thermometers positioned 2x in-tank submerged steady at 80.5F from both left and right side, 2x in-tank (left and right ) above tank water @ 78F and 1x external off-tank for room temp ambient at 67F. Random monitoring of the 2 x hydors 300 ETH shows both heaters operating on heating status (red indicator light lit) between 65-70% of the time.