water temple with no water guardian spawns

hi.. got a water temple spawned in my world.. seed 830205868, cant post co-ords, win10 and all that.. it spawnd in with only 2 elder guardians and ive only seen 3 water guardians in total and none for a lot of game hours, despite extensive work in the area and still having water within the correct spawning parameters... hoping its fixable as im building a guardian farm.. help!! ;0)