I have a 135g reef with trigger 39 sump. Looking to replace my return pump as mine is on its last leg and looking for some help. I really am leaning towards the cor-20 from Neptune so far but open to suggestions. My issue is my return line is already 3/4 hard pipe into a manifold for a uv and reactor and wondering thoughts on if I need a stronger pump being that it's only 3/4 pipe and needs to supply the manifold? I'm hoping the cor-20 would be enough as it does come with 3/4 fittings and is rated 2000gph but of course that will be cut down with the manifold obviously.