well I have no clue how to help as I would have simmilar questions about my tank but on a much smaller scale.
as far as the shark goes it sounds like a great plan but I would add some kind of water splash coming out of the wall as well other wise it will just look like a dear head on the wall, and you want it to look like it is going to drop right on you. (do you get what I am saying?)
Any way good luck and be sure to take lots of pictures as you are building all of this cool stuff!
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Trevor
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