Have you ever seen one of those emergency blankets? they come in a box about 3" by 2". I think they are made of plastic and they are extremely reflective. You could line a stock tank with that stuff cheaply, but be sure that any metallic nature of the product wouldn't be problematic in some way.
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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