sailfin tang reef safe?

[Troy F]

Howdy and welcome to the board. I think that you'll find the sailfin will quickly outgrow your tank. These fellows get large. The crabs usually don't go after the bigger bubbles. I would suggest as much manual removal as you can, trying not to burst the bubbles if possible. It then maybe possible for your mithrax spp. crabs to control the problem. Look to getting some other type of macro alga going to out compete the valonia.