Deadly fish in ocean

Hello who ever is seeing this so i think ocean are to easy with the *ship recks the ancient underwater towers* and stuff like that you can just swim or go on a boat to what i said its really easy and can make hey look i found dimmands to oh look more dimmands so i think it would be a great idea to make them harder like i dont care what just please do but i have a idea deadly fish -that arnt puffer fish cus there more passiv then attack- so the dead ly fish should look like a sleek shilver sorry i dont know how to spell silver and be small like pretty small like the size of a sliver fish the real one and if to find another they should follow them then up to a pack of 7 deadly fish they should do 2 hearts of dmg each and have 15 hearts each and be fast spawn in ship recks and other structures with loot and only stay near it up to 30 blocks if its target goes out of range it comes gack to where it spawned] thanks fellow fans or players of Minecraft for takeing the time out of your day to read and vote good ideas to make Minecraft a better place -yours truly random person on the internet who wants Minecraft harder