lampeye behaviour

Hello! so I have had my tank for a month now and my betta has been in the tank for just over a week. I went to the aquatic shop today and bought 5 schooling lampeye norman fish however after introducing them to the tank one of the 5 isn’t joining the school and is just swimming in the tank...

Following the arrival of my Lampeye fry, today I noticed interesting behaviour with what appears a male and female chasing other fish away from a particular spot. After watching for sometime, I notice the male in particular appears to be guarding an area of the tank which has Ricca Fluitans...