There are many charts out there stating what fish are compatible with others. I think you should research the species first. For example, I have some Buenos Aires Tetra (full size), Two Blue Gourami. They are very territorial nipping at the other fish of the same species. Occasionally they nip...
They are male and female. How do you rec. to stop the bullying? Yes - I know there is too much air to allow a bubble nest at this point - I am not trying to breed them. I just caught some of the ritual on video.
That is a part of the ritual from what I have read or can tell. I have two blue, and they are or have done what you are seeing. Has the male tried to create a bubble nest?
I do not have a structure set up for their bubble nest to work.
I have had a few of my fish do that. One would seem to go scouting while the rest school somewhere. At first I thought they were over stressed, which I know they are somewhat but disproved that with everything I can control was OK.
It did not say, but I assume you have fish in the tank. Make sure that your filters are clean from debri and that you are feeding only what the fish will eat. Fish can go some time without food (some research would state 2 weeks) though that is not a really good idea. Feeding bare minimums would...