[monocus]

2-3 berghia for a 40 if you have about 50 aptasia.the start up is slow,but in a few months they will clean out the problem.fish will not eat them as they taste bad to them.i've seen my lunar wrasse attempt to eat one and then spit it out right away.the good thing about berghia is they are reef safe-all they eat is aptasia;so once you have no aptasia they will starve to death