Hi I need a bit of advice? I have 7 vivs in a twin stack system which consist of 3 bigger vivs on the left and 4 smaller ones on the right. The 3 biggers ones run of 100 watt, 100 watt and a 250 watt heat bulbs which are controlled by thermostats. The tanks stay about 87 hot side and 78 cool side. The other 4 run off 60 watt heat bulbs, although the problem is all of them very seldom turn off as the temp stays the same all day. Is there any other way I can heat these vivs? I forgot to say each of these vivs has a under tank heater as well. Its just with all these bulbs running its very heavy on the electric, the only time I turn the bulbs of is at night because the matts are running. Any suggestions would be great! The 3 vivs on the left house 2 young commons and one taiwan, 4 on right house lizards. Thanks!