You want the flow to be slower than you would have through a standard sump, but the 606's flow is really low. As far as concerned for overflowing, that really depends on what size hole you intend to drill through the 10g to allow for the overflow to operate.
The minijet, IIRC, only operates at a max of 150gph or so. When you add in head losses and line loss, you're actual configuration will vary, but most likely it'll be quite a bit lower than that.
I would consider something up in the 300gph range for a pump, to give you operation in the 200-250gph range.
Oh, and drilling a 10g isn't easy. It's doable (took me a few attempts, but I got it and that's what Im using for my fuge now), but the glass is very thin and easy to crack.
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