I have valonia. Lots of it. I tear down the tank, scrape the stuff off, but it grows back
Last year, got an emerald crab to take care of it, but the crab only ate coralline algae
Got another emerald about a month ago. Ate very little valonia, but did find the tasty ornamental macroalgae I cultivate for nitrate removal
Removed the ornamental MA to another tank, thinking HAH! he's got to eat valonia now
Well, I was wrong. Caught him hunkered down in my galaxy coral munching away
Removed the coral, getting stung all over my hands, but managed to get him out.
Do I take him back to the lfs for some unsuspecting person to buy to eat their corals, or do I rock this sucker? Yes, this is a serious question, BTW
Don't think I'm EVER going to introduce another crab to my tank. EVER, EVER, EVER