I used to use big rocks I grabbed from the beach... He jumped out knocked the rocks in and almost busted my tank... I grabbed him up with 2 hands and put him back in.. mfk'er jumped 6 times before I finally sold him at 2ft... One time he shat on the rug..
No joke. My fish shat on my rug!!!
What an adernaline rush.. Luckily I was home every time he jumped.
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OMG... That is one of my biggest fears. Its like a catch 22. Put something heavy on the top to weigh it down and risk it falling in and cracking the tank or use something not as heavy and have your arowana Bust thru and plunge to his death. Right now mine is about 15in but hasn't tried any dumb ish yet. I know its just a matter of time and I want to be prepared the best I can.