If you are getting the correct flow into the reactor, then you can definitely leave it plumbed the way it is. But, when you plumb everything with a single pump source, you have to consider the fact that if the single pump goes out, it means it will stop feeding the entire system. Having the reactor and skimmer running on different pumps, while uses more space and electricity, it does create a certain level of redundancy.
Regards,
Carlos Chacon
CoralVue