alright so i recently got a sump for my 55 gallon FOWLR tank. the sump is ~20 gallons and it has a mag 7 in it...the first time i ran it it all but flooded my tank witin minutes...so i got a ball valve and slowly adjusted....well as of now the ball valve is all but closed in order for me to get an even flow, yes the pump has gotten fairly noisy..nothing unbareable but definately noticeable.....and even still the tank very very slowly rises...enough for me to not trust it overnight or while im at work....so my ? is is there a way to make a DIY to shut off my pump to avoid overflows or even a cheap product i can buy...most of them i have seen are over a 100 or close....for that money ill just run the sump when im home (which is alot being a new airmen to a new base) but idk what to do...i tried asking around to swap my 7 for a 5 but no bites so idk what to do as far as letting it run without an over flow system set up...is there even a way to like run a hose or something in case it gets to high it will flow back to my sump...i just need something cheap and easy to easier to avoid flooding my display tank...any help would greatly be appreciated thank u