Help with clownfish nem tank

[Beanz]

Hey guys so i had a little 10 gallon that i was gonna use for growing sps frags but have torn that tank down and pulled out my 15. i am gonna plumb this tank into my sump on my main tank so the total volume will b like around 70g. so my question is would i b able to keep a nem in the 15 with some clowns and thats all? the light i have is the jbj 70w mh fixture, and i have 2 koirlia nano powerheads and a quietone 1200 conected to a spray bar for the return. just looking for some input on this idea.

Thanks Ian