I have a hang on overflow for the fact that my aquarium maker used tempered glass so thats why I have it. Equipment (bubble magus mac 3.5 skimmer, tunze osmolator nano ato, replaced tunes with mp10wES, True percale clown, long nose hawkfish, giesemann teszla led, phosban reactor 150, custom built sump etc. Thanks guys I will keep your updated. Also if the sump inlet puts lots off bubbles into sump would restricting flow stop this :)