throw in 3 large male convicts like around 4", that way the grammy wont kill just one, all of their anger is spread out and it ends up working out. Also convicts are very active and attentice almost like little oscars, so they will all come up to the glass when you walk by the tank thus bringing out the grammode, also at feedign time he has no choice but to come out and fight for food so just do that and i have no doubt he will come around in a month.
