Call me crazy milad but didn't we have this chat a couple weeks ago about feeding frozen and pellets too often pinch in the morn smaller pinch in the evening is fine its not quantity it's quality of the food your offering that keeps them happy
post a pic of what your feeder feeds a day in your hand and show us how much your feeding them?? I do as little as possible to interfere with my Eco system it runs naturally and provides plenty of food(if you have a reef) try cutting the feeder out all together for 2weeks your fish will be fine feed them from your hand manually and a very tiny amount and you'll start noticing a difference. Go back and look at your posts they should tell you something.....lots of poop, skimmer underpowered,skimmer intake,oil slick your looking for a mechanical answer when the problem is right in front of you you'll see it even better in the mirror
relax milad let your reef grow your system isn't even a year old yet did you ever hear the old saying" stop picking at it let it grow"
cheers