What kind of insulation could I use? Since our house is rented, I don't think I could put the tub in the ground. Maybe I could put some kind of cover over it to reduce sun exposure. Not sure how that would work, though.
And I forgot to ask, is the tub likely to bow enough to cause a problem? Also, do I need to be worried about dragonfly nymphs or any other fish-eaters getting in the tub? As for circulation, I have an air pump I could use, but I'm not sure how it would stand up to outdoor use.
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