Is it only aluminium backed on one side?
Generally I think the aluminium is there as a reflector so I'd put it on the side you want the heat to stay.
Yes
That's what I thought but all the photos I've found have it the other way around.
Aluminium facing the tank, IMO. Doesn’t make sense the other way.
@hippy started
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Is it only aluminium backed on one side?
Generally I think the aluminium is there as a reflector so I'd put it on the side you want the heat to stay.