All fish will jump to get out of harms way, in your case it's the floor.Don't blame the big fellow Blame yourself.Clownfishes are territorial and will fight to the death.
yes they will.
lets just say i had a dozen false purcs in my one tank. got them all at once about 4 years ago less than an inch big. after 2-3 years i lost 4 due to harrassment by other fish, mainly the largest female clown... then one male jumped, so i had 7 left. by this time 3 of them, the females, were pushing 3 1/2-4 inches, real nice size. the 4 males were only 2 inch. they got along great. never fought. it was MY fault that i felt bad because they would all pair off and one would be alone, so i threw 3 more in because my friend broke down a tank so i took his, 1 female and 2 males. the female was same size as the other females, but brighter in color and could tell it was the new one, much more distinct. one of the males was the same as the other males, 2 inches...but the 2nd male i got was only an inch... but georgous. it had striped stripes on its body of black and white. very cool specimen. so anyway, bad idea. my females were territorial because they laid eggs in certain area and no other fish would be aloud to go near, unless one of the males wanted to fight the other male to take over his spot as father. so, those 2 males were chased by the females, had no where to go and jumped. the larger female was very strong competitor though and actually killed one of my females. i flipped. so i netted the bastard and brought it over to my buds house and said here you go, enjoy, see ya later. so 6 left...and there all happy and peicefull...until i sadly sold my tank to another friend of mine because i wanted to take a break for a few months and save money for a new set up. yet still he has them and there doing great.
so.... yes they can fight, yes one will be dominent, frequently the females seeing they become larger quicker, and will chase others around until they are cornered, and when they are cornered, where else to go but up and out?
and if you still have that one aggressive clown, i dont reccomend going out and buying more clowns, because its going to happen again more then likely. either let her be, or net her up and give her away to someone because its just one of those things where you might think your doing the right thing and buy a partner for the clown, but all females are the same, there going to piss and moan until they get there way...and the male will lose. lol no offence to any females.