all pros no cons in having tons of amphipods and copepods. Copepods are food for your corals and some fish and amphipods are food for a lot of fish and both creatures eat detritus and algaes
Definitely very good. I was thrilled last night when I looked at my newly started tank and saw the glass covered in pods! Like MrCote (I had a history teacher named Mr. Cote, btw ) said, there are lots of things that like to eat them, and they're part of the natural filtration system.