Thnaks for the advice, Rose! Unfortunately, Petco had just received them the day before. The gal working there said they were quarantined, but that they were fine so she let me have them. I was skeptical, but as an eternal optimist, I really did have hope for them. I have lost all but 1 since Wednesday, and he isn't doing so well. After they got home, I noticed redness on their gill/head area, but was still hopeful they would recover. I was wrong. At least they are quarantined and alone in their own tank and not exposed to my other fish (learned my lesson). And yes, I made sure my tank was cycled & levels good before adding them...I have learned that fish keeping requires MUCH patience! With this newfound patience, I think that I will quarantine each group separately so I can keep "friends" together (because I will get more otos, and I will give them all the love and care so they will live!).
Take care

Sharon