Is building a wooden skirt (like an open top canopy, so to speak) an option at all?
I could see a chromis jumping is the only thing. I've been using an eggcrate cover over my 115g but it wasn't enough to stop a canary wrasse from surfing.
I've been meaning to look into bird/garden netting locally, seen some tanks on RC with that and it's not offensively obtrusive.
I used glass covers over my golden dwarf moray tank, I thought it was pretty well sealed up but he still found a way out.
If I ever try an eel again it will be with a wooden top, may still go with an open top if it's tall enough, but at least with walls that they can't slither through.
Anyhow guess what I'm saying is there's always a risk. Sometimes it's not a problem and it's fine, sometimes no matter what you do it isn't enough.
