The Tusotuethis is definitely a recommended tame for these due to not being dismounted when you get stung, plus your long range allows you to damage the cniderias from a distance, so you don’t get stung irregardless and you’re also able to hold your own in the ocean quite easily, in case all the cnids are only at the bottom
I use to go to the beach, swim out a little bit until it agro. Then swim to land again and the cnidarias are following me to land. When it I am standing on land it stops. Then I can easily kill it without taking any damage.