Try a soft plastic mesh for the bream, and heavy duty wire mesh for the cats. If you were for any reason forced to keep these fish "captive" for an extended amount of time you would not want the different types together. Scaled fish will rub the wire (ripping scales) & skin fish will get all tangled in the soft plastic (just speaking from experience). Also use salt on them for a day or so to prevent any serious damage should they rub the walls anyway (also helps with stress as everyone knows by building slime)
On both cages you can lay out the size you need, then staple a sleeve at the top that has a 3" plus opening. Then simply run 3" PVC pipe through the sleeves and connect corners with elbows.
Sounds extremely simple, and it is, but it might be what you are looking for (might not).
Just remember large enough holes for water flow.
Deb
PS Make sure your stripes are eating pellet feed because I doubt any prey would swim into the cage to say hi!
