I have been keeping mine since 2017. I bought them from Canada Copepods and the rotifers do not out complete the copepods they seem to keep in a stable equilibrium. I keep the water tinted at all times so there is food for everyone. Copepods don't breed like rotifers and I have found their populations are not high enough on their own to keep their water from polluting. I think the copepods actually eat the phytoplankton and the rotifers as the rotifers are much smaller. You can clearly see the copepods but you need magnifiers to see the rotifers as there are tiny little spots. I have read the copepods are cannibalistic.
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