There's another type of duct tape that looks like polished stainless steel. It is completely opaque and would also help reflect some of the light back down into your refugium. I'm not sure of the name of it but I've used it in some homemade light reflectors or to improve some cheap store bought ones and it is not effected by the heat and does not come off. It's more expensive than duct tape but still would cost under $10 for the amount you need.
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