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Steamman you said it perfect.... the more stuff you add the more to go wrong. I kinda came up with this myself and so far that's the only kink I can't get out. If you just let the fresh water enter your sump right over your pumps intake to the dt then most of it will stay in the dt. I'm...
The way i have the bulkhead in the sump it's right above my running water level. The fresh saltwater pump kicks on and simply overflows the sump and the excess water goes out the bulkhead and down the drain. Works great. I wouldn't try to do anything to drain the water in your sump or tank lower...
Auto water change is easy. If you can put a bulkhead in your sump right above the highest water level ( Usually when return pump is off and some dt water runs back to the sump ). Now that bulkhead has to get plumed down hill ( the only way it will work is gravity )to a sump pump pit , sink ...
I'd just get another 250 pendant. Nothing is as bright as Metal Halide. If you want to do more sps def go with the mh. Mixed reef with maybe a few sps all the way on top try the t-5's I'd Stick as many as you can over it