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it can be fed/driven by a number of different pumps/means... typically, though via a return sump pump, internal (display) submersible pump, a pump tapped into an internal overflow tower/well or closed loop pump drawing from a bulkhead in the display wall itself.
No ball valves are needed on each tee... none whatsoever. Too ugly, noisy and complicated. Overthought. Manifold tend to equalize flow by virtue of the closed loop. And equal flow is not even necessary or necessarily desired from each outlet. You can finesse individual flow via cheap fittings (reducers or flares).
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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