Hi, I have had my overflow system up and running for about 2 years now, but whenever I feed my fish guppies they always end up in my sump tank. The overflow pipe I have right now is 1" and has gutter guard around it to keep all floating plants and fish out, but the guppies can fit inside the spaces of the gutterguard. Is there anything someone could suggest me using that would keep the guppies out of my sump?