about two days ago i was watching my tank and i figured out the reason you dont use maxi-jets with the open suction end..... im watching the lawnmower blenny eating the film algae he loves so much then he swims under the maxi jet, starts picking algae off of it then WHAM his head got sucked right into it, i rushed and found the cord and unplugged it, i reached in lifted the maxi jet up very very carefully and he wiggled out.... swam down and just laid in his hiding shell.... his huge lips were both red and one of his "antlers" is gone, but today after two days of just laying around and breathing hard hes out and about and back to eating film algae, tuff guy, i feel bad for not thinking of this, i should have known that this was a danger, but ive never had a fish swim in one before.