I’ve always wondered; do the fish realize there’s a cover? Or do they jump anyway, and just smack into the lid, keepers nonethewiser?
I keep Wild betta fish so glass is necessary for those. Yes they still jump. You can hear them in another room and depending on the glass lid used sometimes you’ll hear the lid pop up some. I’ve not lost anyone from the initial bumping but I have learned to cut that plastic strip to almost exact size and shape to accommodate the filter tubing of the canister filters. They can squeeze through some extremely tiny gaps and some of these fish are quite expensive.
As of right now I don’t have a lid on the sw tank. Luckily the clowns are staying put though I do worry. I want a glass canopy but finding one for a 40 breeder is difficult. It doesn’t have the center brace which makes it that much harder.

. Not sure if went through the spaces or entered the weir and jumped from there.
, they do also run into the sides of the tank and never seen them break a spine. Has anyone actually ever had a fish that slammed into the top or side of there tank and actually broke there spine? Not stirring things up just wondering if it's really ever happened and is it physically possible in a tank and how you would know aside from an X-ray machine?;Nurse

