I am building my own frag racks...IMO the cost of magnetic frag racks is crazy! I am using coated magnets and aquarium safe 2 part epoxy to adhere the magnets to the egg crate. I am making a couple different sizes.
I built some racks for the bottom
of the tub out of black egg crate and zip tied 3” pieces of PVC. You can see some of the magnetic racks I made stuck to the back wall.
I built some racks for the bottom
of the tub out of black egg crate and zip tied 3” pieces of PVC. You can see some of the magnetic racks I made stuck to the back wall.