Alternative uses for 30 gal fish tank?

Question

What practical use can I get out of a 30 gal fish tank, besides keeping pets? I am practical, I grow edibles, to give you an idea..

thanks!

Answer 1

Here's a weird but practical use: upend it over a prized veggie plant or two...will keep the frost off and extend your growing season. People might wonder why you have a fish tank in your yard though. :)  

Answer 2

why not list it on craigslist in your area and sell it, or donate to a local school?