You really cant have too many pods
in your system. The amount of food availability will dictate how large your population grows to. Once they exhaust the food supply, the population will diminish. If you continually over feed the system, you will obviously have a larger pod population. Since pods
don't do any harm, and put an insignificant bio load on your filtration, I don't think there is much to worry about.
What I have found, is that as a system matures, the species of pods
and their concentrations will fluctuate. Initially on some systems I have built, there were tons of copepods all over the glass, and were easy to see, as the system matured, they were replaced by large numbers of amphipods. Eventually they attain "homeostasis".