Hey guys!

So i have been making a custom world that i would like to use as a suvival map. I have encountered one problem that I could do with some help solving.

Basically its to do with spawning guardians. I want the ability to make a guardian farm (prismarine is very nice for building with) unfortunately i cannot have naturally spawning structures :( The only way i can think to solve this problem would be to add mob spawners and have them spawning guardians. and if that is the only way than that is the only way. but I was wondering if there was any other way to get guardians naturally spawning to farm prismarine from.

Any advice would be welcome here ^^

Thank you!