I was thinking of doing something similar to this but I was going to build a huge, well insulated plywood tank.
I was going to build a plywood box the size I wanted, then use 2x2-2x4 bracing around the outside then use cellotex and expanding foam to insulate it and use treated tung and groove to finish it off.
Then build a sloped roof and 2 large accesses panels above the glass for cleaning and maintenance and an insulated panel I could clip on in front off the glass for when it gets really cold.
Basically think a big well insulated shed with a glass panel lol
I worked out the insulation and it should stay as warm as keeping it in your house without your heating on, just what I was planning but trust me a pond will cost mega bucks to heat because the heat escapes strait out of the top
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this sounds like an insane idea. I'll definitely think about this. thanks mate. did you end up doing it?
"big ball of light, spits out dinosaurs" - Mac, Primeval New World