The eggcrate cuts easily with side cutters but be sure to wear safety glasses. You can get a nice clean edge by making sure the cutters are flush with the remaining plastic. C.A. cichlid keepers have been using this for years on end to not only separate fish but to protect heaters and filter tubes. When I was spawning Jags, Dovi etc. with some fish I would use the pass through method. One occasion the fish would spawn right through the eggcrate, when kept apart. Just place s slate under the crate. You wouldn't get as big a spawn but with those fish that is a plus.