Yes but N has mentioned the fact that their friend has no such fish? But very possible from egg scattering fish and the egg has hitchiked a ride.Whatever it turns out to be, it came from fish who scatter their eggs. I have had eggs from zebra, choprae and roseus danios all get stuck on plants and moved to another new tank where they hatched out. What made this more amazing is the two new tanks were having ammonia added to them to start or hold a cycle. When I spotted the fry the ammonia additions stopped.