Though your tank looks nice you are WAY over stocked. It's not the fact that you are trying to feed them enough. It's all the aggression becuase of the confinement. Not to get all "Tang Police" on you but your tank is too small for one tang let alone 2. I wouldnt doubt if the yellow tang was bullying the new additions.
Just becuase they survive doesnt mean they are thriving.
You seem to care about the fish, or you wouldnt have come here to find out what happened. Do them and yourself a favour and stop adding more! That and relocate some of your other fish until you can have that big tank you want. Not having a large tank now doesnt make it right that you go out and stock your 50 like it was a 250.
Again, im not trying to be a jerk, and im not one of those people to say something negative about someone who obviously enjoys the hobby. You are just making things worse for yourself and the inhabitants of your tank by grossly overstocking your tank.
Just becuase they survive doesnt mean they are thriving.
You seem to care about the fish, or you wouldnt have come here to find out what happened. Do them and yourself a favour and stop adding more! That and relocate some of your other fish until you can have that big tank you want. Not having a large tank now doesnt make it right that you go out and stock your 50 like it was a 250.
Again, im not trying to be a jerk, and im not one of those people to say something negative about someone who obviously enjoys the hobby. You are just making things worse for yourself and the inhabitants of your tank by grossly overstocking your tank.