25 years of reef keeping and I used to only wear gloves for moving rockwork, fragging, etc - heavier tank work. In the past 6 months to year I have developed a real sensitivity, getting poison ivy-like blisters on random spots of my hands and arms from water contact (not efen directly brushing coral or rock). The blisters last for a week or more and itch.
now I use the should length calving gloves, with dishwashing gloves over. And rubber bands to hold both in place. It is a royal pain, but the calving gloves seem to use alone and the dishwashing gloves are not long enough.
I have a pair of the yellow should length, heavy duty gloves, but they are too thick, and one-size-doesn’t-fit-all. I wear a women’s small or extra small glove and all of the really protective gloves seem to be made for large or extra large men…
hoping that my current hyper-reactivity to the tank is due to a cyano issue I am working on In my main mixed reef. I have no issues with putting my hand in my softie tank. Both have RBTA, which was one of my suspects.