gravel heater

Hello all, this looks like an interesting forum. I found a 15 page thread here that described people wrestling with the Fluval C02 system. Before I get into that, let me give you some of my info. I have a 30 gal, fish include roselines, a red tail shark, danios, tetras, & 3 angels. I know...

Has anyone tried to heat an aquarium via a sheet heater adhered to the outside of the glass? (Mcmaster-carr part number 35765K287) Obviously that's only a heater and I'd need a separate heat controller / temperature probe. So it's a 12" X 18" silicone sheet putting out 2.5 watts per square...