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Oli,
This isn't going to be easy. Bottom drains on a tiled floor mean you to lift the whole thing off the ground to get them underneath. I don't see this as possible.
2nd, having the waterfall in the middle means every thing behind it stays on the bottom and rots unless you take the time to vacuum it out every day.
My main concern is what kind of filtration are you planning to use?
Realise you are going to need to move masses of water to get the effect you are looking for. to have anything resembling a stream-like flow is going to mean having a filter system that can cope. If you don't you will end up with masses of foamy bubbles. This in turn will leave you with fish that are hard to see as well.
Please tell me you are not planning to put a layer of gravel of pebbles on the bottom. If you are this is going to make things MUCH WORSE.
I think you are perhaps being a bit too ambitious and should seek something more traditional.
B.Scott
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