Solid advise.What you have established in 3 months is in good health.
Do not add the free fish into your tank and risk causing an outbreak of stress, or fighting for territory, and common disease and pests that could be dormant in your tank or in the free livestock. Keep those in a 5 gallon bucket and donate them to the LFS. You have to nice of an existing tank to risk over crowding and disease issues trying to save 3 may easily kill them all.
