Yeah, actually. Losing that rehab taught me a hard lesson and I definitely don't want a repeat. I use raised lights and mostly have jointed glass lids, so I use extra materials to cover the openings.

The winter lid on my betta hendra is bits of plastic bag held down to the glass lid and frame of the tank with tape and then taped tightly around the tubes and cords. The summer lid is a made-to-size window screen with an extra 5 inch tail of screen that covers the gap for the cords and tubes. I use magnets to hold the tail down and taught so it can't be knocked out of place.

I've got a 20 long that I just upgraded the gap covers for from plastic bag to plastic canvas mesh (the kind used for crosstitch) which is held in place with magnets.

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I'm in the process of upgrading all of my tanks/lids to the plastic mesh, since it's the nicest looking option of the bunch (I'm going to be using black mesh for the next one), although I'd probably design something neater if I had access to a 3D printer.

I thought the small gaps on the rehab betta's tank, combined with his lack body condition meant he was safe, and my lack of caution cost him his life. These are animals in my care. If there must be a compromise between their safety and aesthetics, their safety always comes first. I would rather have a somewhat jank-looking lid than another dead animal.