Thank-you for your insight. The blue acaras have only been in there for a few days and are still young - they're just starting to develop their colors now. They're pretty fun little guys! Would they still have "established" the tank for themselves?
Uh oh...maybe I just learned something. My understanding is that dither fish can help calm aggression as well as coax shy fish out from hiding. I'm new at this so I wouldn't be surprised if I'm wrong.
Its hard to say. If your Blue acaras are small yet they might not be too territorial yet. I just wouldn't add a single angel to that tank. When you add a single individual it doesn't have any buddies to group with for protection and usually becomes a target. It might work, anything is possible and if all fish are young enough you might get away with it. Since you added the red eye tetras first you might be able to sneek something else in there without too much trouble.
Forgot about tankmate recommendations. It really depends on if you have a "pair" of Blue acaras. If it is a compatible pair, they will be much more territorial when they begin to spawn. It also depends on your preference as far as what fish in the tank you feel should be the priority and center of attention. If its the acara pair, then you would need to choose something that wouldn't threaten them and try to dominate the tank. In that case you would need something submissive in nature like another mild mannered cichlid. Keyhole cichlids, port cichlids, Severums are just a few that come to mind in the same size category. You could choose a pair of Kribensis cichlids as these guys are not too aggressive and don't grow near the size of the acaras, but could take care of themselves. And of course you can still go with Angels, just go with more of them, like 3 or 5 and add them all at the same time.
