heh... I'm still thinking about it. I really like the idea of heat the water that way so I don't burn any lizards or frogs that might decide to sit on the heater!
Guess why that heat mat in th e past wasn't doing anything... It was only 7 watts!!! No wonder it wasn't warming at all... I know it was passing electricity through it though, I shocked myself pretty badly on it at one point before I cut the cord off and tossed the mat. The ones I have now are grow mats for plants, so not as much worry about them being crap like the ones from the pet stores (way cheaper too, I ended up with two in the first little greenhouse kit I bought, so they came out to $15 a piece, and the 25W one was $25, they are all just a little bigger than the footprint of a ten gallon). They are meant to be under a pan of water, but it's plastic, not glass, so I was worried that it might break the glass, but wasn't sure if it was the same risk without the pad contacting the glass. My roach bin sits atop one of the 15W mats, and it get's the temps just right without melting the plastic or anything.
I might give this a try, but I don't think it's something I should do by myself... The tank is really really heavy (over 100lbs of stuff in it I'm not willing to remove, plus the weight of the tank itself!), and without someone to help me lift it evenly, I'm afraid I break either the tank or the heater trying to get it under there... I really shouldn't have tried to put in on the counter alone, and if the counter hadn't been right beside it, I wouldn't have tried. I was very close to dropping the whole thing a few times, but I was able to use leverage to lift it and get it up there. BUT, on the bright side, it gives me more time to plan the implementation. For example, I was thinking that instead of using stick on feet or strips of foam to raise it and seal it off, I could make something out of a piece of pink insulating foam to raise and seal it. I could get a 2" thick piece and cut it just a bit bigger than the tank frame, then remove the center of the foam piece (so it looks like a picture frame), carve a channel for the tank frame to rest in and a notch for the power cord and voila!, a sturdier, easier to install and maintain version of what I'd be doing with the foam tape. This would also allow me to create a deeper pocket of air and minimize the risk of contact should the mat curl at the edges.
The only problem with hanging it off the edge is that the side I need to put in on isn't on the edge, lol...
I DO have a lamp dimmer I was already planning to use, that way I can dial the temps if they aren't where I want them.
I do appreciate your help, don't think I kept you up for nothing, ok? I can see how the idea should work, and you showed me I should wait until I have someone to help me move it. I will be sure to post about it when I get it done.
Of course, if my hubby refuses to help, I might just have to go buy another heater...
Oh yeah, I almost forgot! I haven't gotten that filter media rigged up around the intake pipe yet, but this morning it's still running at the same speed it was last night, so hopefully that problem is fixed for now.