OIIKI 4 PCS Egg Crate for Aquarium, Fish Tank Bottom Isolation, Grid Tank Divider Tray for Mixed Breeding(Black)

Needed something to keep my cats out while also allowing sufficient airflow, these did the trick for 2 of my tanks that did not already have lids. They are spaced out enough so that the light will still shine through and sturdy enough to keep out my fat cats looking for a snack (JK they just want to boop them).

It fits my Fluval Evo 13.5 perfectly. The pieces snap in using the zig-zagged connectors, I suggest you take a hammer, cover the pieces with cloths and lightly hammer it in. Don't use your hands. You connect two pieces sideways, then connect them vertically, then fits the evo perfectly.The light shines perfectly fine on the corals, and my blenny has not jumped out yet. It does what it's supposed to do!The crate is a bit thick for my taste, but I understand it is there to give it additional strength. Also if you want to undo the connections, make sure you wear a glove, I used my hands to try to push it apart, the product scratched about 2cm worth of skin from my thumb, and dug a bit into the skin too, and I kept bleeding lightly for a few hours.Overall great $20 solution to an aquarium lid.

I used this for the top of a fish tank. Works perfectly, and my filter sits in a funny spot, so I had to cute this a bit, it did not take away from the strength and was very easy to do.

I feel so silly! Holes too big for my beta fish 😂

It’s useful.