That model u showed a pic of, made by rubbermaid, the 300 gallon model, they have a bunch at my local home improvement store, the Green Thumb. They are NOT 5 feet by 5 feet by 3 feet deep, and they certainly didnt look like they could hold a shark. Maybe a single ray, but thats pretty much it. The SIZE u specified previously could, in my opinion, possibly hold maybe some bamboo sharks or rays, but not much else, and if u wanted a tub that could hold A LOT of animals, then it is too BIG to be inside, they need to be OUTSIDE, in the GROUND. Im talking like a 1000 gallon pond. I wasnt talking about yer little 300 gallon. And I wasnt insulting u. So, u just need to chill. For Cartman101, if u wanted a good sized shark pool, u would be best off getting a longer, oval shaped tub approximately 2 feet tall, maybe 8 feet long and 4-4 1/2 feet wide. That would be ideal, in my own words, to house some cooler sharks other than bamboo sharks. Rays too. U just need to figure out a way to make usre they dont jump outta the pond thing... Thats sumthing that i dont know how to do though. Maybe netting? Glass? Watever, Im done.