The three have been together for so long and have grown full size, my feeling is that I don't need more. They are always together, eat and swim well. I don't see a social issue at all with them. I am leaning toward 'don't fix if it's not broken'. Thank you for your advice! I love this forum.Yeah I agree, like I said it could screw with the pecking order and make a mess out of your tank. It’s honestly up to you what you would want to do.