When is the plan for the next bigger tank? One thats wider than 24"...
In the video I saw some aggression on the part of the Jardini already toward the other arrows. This will only get worse as he gets bigger. I personally would reduce the stock by getting rid of him and the silver. Keep the black (only if you are getting a bigger tank, at least 30" wide). Get rid of both big cats, they will outgrow the tank in no time and very few can house those things properly. Get rid of the ray, your tank is not wide enough for it either.