One idea which I'm thinking about doing on my 125g is drilling the back at desired water height for the outlet or drilling the bottom with 3/4 inch pipe run into a tee at the desired water height. The with the tee there is less chance of blocking up , extra safety. Either option the waste water is plumbed up to outside the it runs over the garden.
For the inlet my plan is to plumb it in to house plumbing, using a 12volt 3/4 inch electric solenoid valve. The valve powered by a transformer and switched on and off by a timer. Probably run it 4 times a day, I would rather in small amounts and more often than large amounts less often as of the water change. Then for the cloramine I'm hoping to run a "evolution Aqua detox dechlorinator" which is an in line filter.