I have read of others with this problem.. it may be a means of reproduction.. not sure... I have 2 linkia.. so I am curious if you can relate any tank and water parameters then ( or now) ?
How much live rock in your tank? What are your water conditions (pH, Ca ion conc. ? Do you have abundant coral ? How about algae types. Refugium ? Skimmer?
It might be nice to have some one with xperience help with linkia
problems... but I have had both of mine for less than a year.. so I hardly qualify.
I hope you didnt flush the guy.. he may have been stressed, but he may have recovered. Who knows ?