Ouch. Large petricola's are gonna be costly. Should buy em small and grow em out. A member in Richmond used to breed em. I wonder if Petland Poco/King Ed's/Fish Addicts, has anything on sale this week for ya. And there was one or two members selling Calvus a couple months ago. Good luck. I wouldn't part with my Petricola's for anything. Most active fish in the tank.....