I have had my two clowns for a year and my only lps here has a large picaso trigger.the only others i have is a yellow (watchman)goby and a pencil sea urchin.my question is should i start off with a smaller trigger?no matter what fish i have put in there every nasty damsel they sell,no fish ever bothers these two clowns.if i get this trigger being large will i have to get agressive fish?i would like to get a lawnmower blenny,yellow tang,purple yellow dottyback and maybe a puffer.i have a 75 gal comm tank.