carey
Aquarium Advice Addict
My sump also fills to within a few inches of the top of the sump. I always hold my breath when I shut down the system, LOL, I know it won't overflow but it's still in the back of my mind. I also keep my tank the least full I can, I have my overflow as far down as it can go and I just keep the water level right above that.
As a further backup you can add a check valve in the return pump section, it won't let ANY water back siphon. I got mine at home depot for like $7. Between that and the holes in my output I feel pretty good about it all.
As a further backup you can add a check valve in the return pump section, it won't let ANY water back siphon. I got mine at home depot for like $7. Between that and the holes in my output I feel pretty good about it all.