i have my lion and shark together, they rarely evan see each other let alone bother each other,, but i also have them in a 300 gallon tank! in a 125 ytour askign for ALOT of problems! anythign under 250 IMHO your asking for problems, plus baded cats get 35+ inches long! and they do it quickly!
regardless of what people think, i got my shark maybe 3-4 months ago im not sure, he came in at about 14-16 inches and he already had to put on another inch or so already. i DO feed him ALOt and Regularly!