my silver is about 5" now and never had him jump when cleaning and what not with the lid off the tank but i added some larger fish(discus)in a large bag so i had to keep the top of and he jumped out 3 times one right after another i had to sit there and play catcher. i even tryed standing right over the side with no cover to scare him away and he about hit me in the face. so my ? is i plan on more big bags and how do i keep this thing in the tank.or do i need to put him in another tank when im adding other fish