Niger trigger

[piccasotrigger]

Im wondering why are none of my fish extmely agressive wen it comes to feeding none of them even go up to the top to get the ball of brine shrimp i have a 1 and a half inch niger trigger and a 2in saddle puffer and a 2 in valentn puffer and none really eat alot but all of them eat a little bit

 

[piccasotrigger]

Im also wondering why this one hides so much the puffers are always swimming but the niger trigger hides constantly or he will just swim behind the live rock an everytime i go in the room he will hide again the puffers aren not picking on him. Also i was wondering wat is a good showpiece fish for a 120 gallons that can go with a clown trigger and a blue throat trigger