herpes...
if at all possible
in a brute can, maybe 22gal or better 32 gal full freshwater (drinking level quality, not purified)
dip the entire rock
do it like every few days for a couple weeks will definitely reduce the population
submerge n shake then return to tank
even better to have 2 fw...
It’s great if the club has all of these tools for emergencies and or tank moves...
But if the problem is in Novato and the tools are in Santa Clara...that’s a problem!
If possible and the club can afford it, I recommend at least 3 sets to “not too far” locations around the Bay.
Just a thought...