Nov 2022 is fivce months. I wold return the four, they are not going to be happy and may well turn nippy of other fish because of the inadeq1uate group size. I asked because with old fish that you have had for say 10-12 years and as they die off from old age you may be left with one or two or four, that is s very different scenario. With young fish such as stores sell, they absolutely must have a group. So returning them would be the humane thing to do rather than keeping them.