Make the overflows yourself. Google "durso pipes". They are much cheaper. The set up will work well. I have a similar set up in a 90g. It is acrylic and I drilled the overflows and return and use danner supreme mag drives in all of my tanks. The 90g has a mag9.5 (950gph). Depending on the bio load in the tank you may want to use two 5g buckets and two or 4 durso pipe set ups. I would not recommend using a ball valve on your pump. It puts uneeded stress on it. If you really want to use that pump without getting mover overflows, then plumb a T into the return line. One side goes into the tank and the other side recycles back into the sump with a ball valve, either back over the bio balls or just back into the bottom of the sump. A ball valve is a valve that you plumb into a line that has a knob or lever that you use to turn a ball isnide the line and control how much water flows. Cost depends on diameter, about $5 at home depot. I would also fill the bottom of your sump with submerged media... Even just extra gravel. You can also put your heaters in your sump to clean your tank up. Or to cost less, leave the heaters in the tank and use a rubbermaid bin instead of a fish tank for the sump.
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