hydor mini heaters are tiny, could have one in the bottom, like the picture for the tulip I think it is you could maybe have something decorative rather than an actual 'lid' but things to made lids from wouldn't be hard, and i'm creative to say the least.....think I'm gonna get an Azoo when I get a new job!!!
Hydor 7W heater.....and betta betta betta
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i wouldnt trust those mini heaters, they arent thermostaticly controled.
Mel's used them a lot and don't think she's had any problems....havce PM'd to ask her though![]()
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i got one from mel, its a really good heater, kept my tank at 80 constantly... so i got another one today.

OMG that's insane AND amazing!