Okay so I recently started stocking my tank (55gallon). Added 10 cardinal tetras and through the first night 8 survived. Day two 6/8 schooled very tightly while the other two just stay in a patch of wisteria. No one has eaten yet either. Day three I can't find the two that hid in the wisteria anywhere. No remains anywhere. I looked around the tank and they haven't jumped out either (maybe the others ate them?). Another interesting thing I noticed is that when the lights go off the cardinals tend to find their own sleeping spots to chill for the night. Is this normal?