When i first put the CPD's in they hid for a bit then came out to eat. i fed them some frozen food and they seemed quite happy. I just got home and all 5 of them seem to be glass surfing and swimming back and forth along the glass... seems like strange behaviour.. is this a sign that something is off or wrong in the tank or just the fish adapting to the new pad?
This is common behavior. I have had fish that did this for like 8 hours a day for many years... they're stupid, what do you expect?