>>Since you probably have anywhere from 2 to 7 gallons of water in the tank ( dependant on the size ) I would use the lower wattage units as you dont have to warm up that much water. I have a 10 and 30 gallon tank and I use a 50 watt heater in both of them and the tanks stay at the proper temps.
>>Luckily before I constructed my tank I planned this out well ahead. In the rear left corner of both tanks there is a 1/4 curl tube of cork bark that runs top to bottom and allows me to have access to the reservoir of water. Although I can barely fit my hand in it, I can manage to get a heater and a pump down in there. I will take some pics tonight and post them tomorrow.
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>>Rob
Well, I wanted to have access to the pump when everything was up, so I have a setup somewhat like yours. Instead of a piece of cork bark though, I have a 3" piece of PVC pipe with holes in the bottom. This is covered by one of those 'half log' corner hides, which is then covered with dirt. So I do have access to the bottom. There's enough room for the pump, but not much else. Still, I might be able to lift the pipe enough to slide a heater underneath it. I might be able to take some pictures tonight.