that stinks, sorry to hear about it. My clown has never jumped in the 3 years I have had him. Unfortunately He wont be the last you lose over the years, but don't let it discourage you.
I feel your pain...I purchased 2 baby gold maroon's (< "1) from a member this past week. One jumped after 5 minutes of being in the tank and the other is MIA. I've had my tank for 14 yrs and it's the first time I've ever had a clown jump. I've had plenty of other jumpers, but never a clown.