for rio pumps, it is usable...but for how long, no one knows yet...rio pumps are not meant for high pressure stuffs...it might spoilt in the long run...
the stronger the pump the better the performance..if u are not gonna place the skimmer very far away from the sump and pump, i suggest md40 will be sufficient...cheaper and lesser power consumption...if u want better performance go for the md55...u want subperb performance go for mx70 or even 100...but i'm not sure if the skimmer can handle the turbulence...too much turbulence, your skimmer will not work efficiently as well...