Blocks and concrete floors are good. A lot of people use pre-formed ponds (as have I in the past.) If you go this route I would absolutely go with the largest one you can get. You can put a shower drain in the bottom and run pvc pipe off of it for drainage. I would suggest trying to install one on one of those $20 dollar ponds first or even one of those $8 bins you mix concrete in before trying it on the full size (expensive) ponds. Workable drains are indispensible with waters and a much better alternative to draining out the pool with a python-type aquarium vacuum. (No pun intended this really sucks.).

You would really be better off doing a pond made from concrete blocks and as crazy as this may sound I would do it at about half the size of your 8x8 room. If you look around for books on ornamental ponds some of them go into detail on how to build ponds from blocks. You can probably look around websites that deal with koi ponds and get tons of info there. Of course if you work with concrete or do pool work that is even better. If you haven't blocks are relatively simple to work with for someone who hasn't done such work. You don't really need for it to be deep you could make it 2 8"x8"x16" blocks deep and to it off with a 4"x8"x16" solid block and it would be plenty deep for you. Once again you will want to think about how to drain it. If you haven't done a concrete pond before I would suggest doing one or 2 (or more) outside first to get the hang of it and make sure you know how to keep it from leaking before trying one inside.

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