What watt would you recomend? I was thinking a 60w in the midle and bottom.With the probe in the top viv,it stays at 92 - 94f,, but the bottom one is the hottest.Would putting a 60w in the middle and bottom vivs make a difference to the heat in the top viv even though its got a 100w in it? or where do you reccomend i put the probe? I mean the probe from the thermostat.