here a pic of the mock up of what will be in the overflow box,
the left most is the wet/dry pipe with a slider like thing that you can attach float switchs, and other stuff.
the two center is basicall a Herbie overflow
the right most is the return, i am not to happy about the 1 inch water flow slamming into the T, have to find a different solution,
here a pic with these painted with krylon fusion, and float switches installed,
so basically,
the 3rd from the left is the main siphon, if that gets clogged it will trip the first float switch as a "warning",
then the 2nd from the left is an open drain, if that gets clogged it will trip the second float switch as a "oh ****",
then the 1st from the left which is the last defense, the straw diameter drain, hahhaha, hmmm not sure how much this will help...