Hi Shells, they're not a bad skimmer, the foam head tends to go away when anything goes in the tank, pumpwise the mag 7 , 1 plus with this style is they are more life friendly than the needlewheels , here a quote from them about pump size, ps. the mags do run a bit hot and are prone to leaks.
As of our last printing, the Danner Supreme Mag Drive 7 is our favorite pump on the
EV-180 skimmer. Other submersible pumps with a similar flow curve should produce
comparable results to the Mag 7. The Iwaki 30 RLT is our favorite external pump on
the EV-180 skimmer. If you use an external pump, we recommend that you add a gate
valve to the pump’s output. This will help you fine-tune the flow to the skimmer.
Some of our customers report increased performance when running a water pump that
is rated higher than what we recommend. For example, a Mag 9.5 can “overdrive” the
EV-180 and produce even better results. If you choose to use a larger water pump,
please be aware that it is very easy to overdrive the skimmer in such a way that the
performance will actually suffer! The EV-180 is designed to handle a certain amount of
water flow, and it is possible to choke off the spray injector, which will result in a
decrease in performance. If you use a larger water pump, be sure and add a gate
valve to the pump’s output so that you can fine-tune the flow to the skimmer. At
no time should the water level inside the skimmer be any higher than the the top of the
dark gray box.