I recently posted a thread about my pacu being aggresive to my RD, but it seemed like it was just trying to play and has left it alone.However my RD is still hiding in the cave and rarely comes out. Its been three days since i brought it here. It does occasionally come out to give my pacu a chase but returns shortly after seeing me. So i was thinking that adding dithers will help, but which one? They shouldn't be small enough to get eaten by my pacu or snakehead.