I just introduced 2 Oscars and a JD to my 125g last week. All my readings are normal regarding parameters and I do 50% water changes every Friday. Last night I came home and found the fins of one of the Oscars and the JD to be split and looking kind of ragged. The only other fish in the tank is a pleco. The other Oscars fins look fine, should I be concerned? I haven't fed any live foods only Hikari....

