How agressive are we talking(the bigger one will bully smaller one and over the course of 18 to 24 month go through hermaphrodetic dimorphism(grow lady parts and have a wider cloeca.eventually becoming a female(all clowns are born male) Now if fin nipping occurs you can always try the mirror trick(done to tangs to stop agression to new arrivals) most damselfish are territorial ime which leads to agression in the small confines of a little box and synthetic conditions, you could also try feeding more as well to reduce competition aswell as more frequently, doing a 15 to 25% water change weekly will help stabilize amount of pollution in water column, i would reccomend feeding something like spectrum at first then maybe moving up to frozen mysis soaked in selcon, nori and a variety of foods oyster feast when feeding sps reefroids etc i culture my own pods and baby brine so i grab some cheato outta the sump and putsome tiger pods and bb on cheato and they can graze on that for a day if you have more fish 2 days if only fish and pollutes water less than frozen or pellet they key to hsppy clowns is good nutrition and awide variety of foods
Just my 2 cents- your pal nick
