cheery barb

Hi all. This is my first post. I have an 850L hardscape tank. I am going for a community tank and have about 20 rummy nose tetra, 20 cardinal tetras, 5 white fin tetra, 6 plecos, 3 bristlenose catfish , and 10 cherries (5m/5F). I got 4 fancy guppies today, and the female cherries have killed...