Fighting fish Help! *Beginner*

Jul 8, 2017
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#1
hello, I just set up my tank. I let it run for a month to let the water cycle. I just recently stocked my fish 15gallon tank with 3 cortadoras 3 neon tetras 1 guppy and a small pleno.

The very first fish I put in was my dwarf gourami. I then started getting the rest of the fish within a week. I just noticed that my guppy has been hiding behind my filter. I then saw that my gourami has been chasing it and darting at it.
And one of my neon is hiding inside my coconut hut.

What should I do ?