Just a warning for those that have "jumpy" fish you might consider treating in a separate tank.

I had a cherry barb with a swim bladder infection. I moved her to my hospital tank and began treatment.

I found this on the kitchen floor the next morning.



She must have jumped out...



Here's the lid she managed to squeeze through. I thought she'd be too fat for such a gap...obviously not!



So...don't assume a lid like that above is ok - it isn't