The suction cups with my turtle docks never stayed on for long even after cleaning the suction cups. So my turtle, who is now very large relative to the dock, keeps flipping it over. This design clips over the edge and keeps it from flipping. It's a little snug and if I was to do it again, I would increase the diameter of the hook. But it works good enough for now.

Made with Petg to withstand aquarium water and UV and 100 dense to keep from floating.

Update 5/16/26. The hook diameter was too tight so I increased that and the distance of the gap. Also increased the thickness too to make it sturdier. I left the old pics and added two new pics.