I used peppermint shrimp and file fish together in softy tank ; worked well, but ALWAYS one survivor and if you move that rock to another tank say, bam - also found out my non coral nipper file fish for over a year acquired a taste for hammers , Duncan’s ect. So back to the softy tank and removed the one rock that had one aptasia “survivor and also in softy tank. Haven’t seen any now for 3months .fingers crossed and wood touched lol!!