Tips to avoid leaks or flood in FOWLR tank

[GreenSpottedPuffer]

I woke up to about 40G of water on my floor this morning

RO/DI water though...left it on overnight and forgot. I still haven't set up a float valve, been putting it off but I will be doing that this weekend now!

That doesn't help much but I think if your in the hobby long enough, you end up with some sort of flood, big or small. Try to do a bunch of research and do your best to keep the water in the tanks. Over the years, none of my displays have ever flooded. Actually only ever RO water.