I have a 55 gallon tank that currently houses 4 buenos aries tetras, 2 pictus cats, and a red tailed black shark. It's probably going to end up with two giant danios as well if neither of the pet stores in town will take them. I'm interested in either adding 3 angelfish or a school of 10-12 something or others. I'd like to go with the angels, but from what I've read, buenos aries can be somewhat nippy, and my rtbs goes through spouts of hating everyone else in the tank. So right now I'm leaning towards the school. I'd like to add some rummynose tetras, but the only place around here that I've ever seen them is Petco. I have seen them in tanks in stores that are further away where they appeared to be 2 1/2-3 inches, but some sources I've seen online say they only get to 2 inches. Will they get big enough for the pictus to not eat? The two pictus I have are only 2 inches now, so I don't think that they're big enough to eat any rummynose yet. Today, I was looking around in a pet store and saw some celebese rainbow fish. They were in freshwater tanks there, but one website I saw online said they need brackish water. Does anybody have any experience with these fish, and do they school? If anybody has any suggestions on another type of fish, feel free to express them. Thanks.