Been battling valonia now for a few months. Have 20gal so fish who eat valonia are no go. Have dropped in 4 emerald crabs. They've been in there for weeks now and barely touch the stuff. Been doing manual removal. Very difficult as I have to remove each rock, remove valonia, and sanitize area where valonia removed. I'm VERY hesitant to remove bottom rocks as I have two anemenies and a sea cucumber suspected or known to be attached to or under the rocks. Basically I'm at a point where I have to remove the bottom rocks to clean them. Is this just a terrible idea? Will emeralds become more interested in the valonia if I'm more patient? I'm also worried this level of disturbance, essentially removal of all rocks in tank, will have a negative impact on the other inhabitants. Any advice or ideas on this issue is greatly appreciated!