You can use SS mesh for the overflow combs instead. I use it to keep out small fish like tetra. But the fry will likely go through.
If you want to save the fry then add a durso pipe or a raised pipe to the overflow to raise the water level. Also leave the first chamber of the sump empty. Then you can fish out the fry.
Or you can just shut down the sump and go with some other kind of filter.
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