Now that's what I call one helleva birthday gift! Congrats! You guys are quickly catching up to seasoned home aquarists. Eff dabbing your foot in the pool to test the waters...Just dive off of the effin diving board! That's what I'm talkin bout!
In the words of the great Mike Arowanabe, 'Let the games begin!'
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One question... is it a good idea to put pot scrubbies in the overflows?
Very good choice on tank ornaments. You did a beautiful job at decorating it, and I think that tank is going to have some happy ray inhabitants.
I saw that DBJunkie mentioned Characins. I wonder what we could throw in there that wouldn't become a snack. With the fluidized bed filters that we have coming in, I'm not worried about the bioload, at least.
I would through a couple spotted gar in there with the rays but that is just me. When you look for a house, keep in mind that you will no longer be living on a concrete pad and you will have to support the floor to house these monster tanks. So buy a house with a taller crawl space since you will be spending some time under it with heavy wood LOL!