Open Tops/Rimless Tanks with fish

[justinl]

i used to have a rimless 60g, but after i had my first carpet surfer (a red coris), i vowed never again. now i used a DIY open topped canopy. I don't advise anyone for the rimless thing anymore though i can still see the appeal. Just pick fish that are known NON jumpers. could you maybe have a rimless but not fill the tank full? like by leaving six inches or so of clearance? it would essentially be like having a small clear permanent canopy; keep in mind that that would effectively make your tank volume smaller than its standard rating.