adding angel to 46g tank

Question
Hi
My 46g tank have a bunch of live plants and it also have a fluval 405 and whisper 60 as filter and temp set at 78. i currently have two angels about 3 in each along with two boesmani rainbow and one butterfly pleco (stay bellow 5 in). I want to add one more angel to the tank. Is that okay? Is the new angel going to cause a problem with my old angel? another question. One of my currently own angel doesn't seem to be interested in eating flakes and freezedried shrimp. about one week ago i have to put both angels in my 10 gallon tank for a about four or five days because i need to add some nutrients for the plants. but after i put the angel back into the 46 gallon tank, the slitly smaller angel and rainbows still eat like normal but my larger angel only eat one flake each time i feed him. He just stare at the food floating at the surface and swim down to the Amazon Sword. it he just stress out or its their some thing wrong with him?
Thank you

Answer
He is probably stress because he is being removed from his tank, places in a smaller tank and then moved again. It is never a good idea to remove the fish unless they are sick or injured. It should be ok to add another but as for the fighting, there is no way to tell until the new fish is in the tank. Some fish do well and some don't. Unfortunately, it is more of a hit and miss. You can try adding the new angel but keep an eye on them in case problems arise or you have to remove it. Each fish has its own personalty and what works for one person might not work for another.