Ummmmmm....Tropical?????!!!!
This fish is cold-water ONLY!!!

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Even at a variant of 64-70 degrees, this fish will not make it. Never keep a sturgeon in aquaria. It took me 1 day to realize that, literally. I am not trying to be mean, but sturgeon are awesome fish but simply do not do well in aquaria. They are cold-water species, do not recover well when underfed (as such and not due to neglect, but nature itself). If you know anyone with a pond, give it or sell it to them immediately for the fish's well being (if it is not already too late).
Case is in point : I will be surprised if that fish is not dead in 2 weeks.
Respectfully as allways.