It’s a 90. Just spent about 40 mins pulling bubble algae. I have lots of zoas so worry about emerald crabs.Female emerald crabs and if you have a large enough tank, one spot foxface are usually pretty good with valonia. I had a one spot in my 90g, but he got too big (which I knew would happen) and re-homed him to a much larger tank, but he was one of the best algae grazers I've ever kept and always kept the tank clear of valonia.