I would like to run a manifold on my "newer" nearly 1 year old tank build. It is an 80g with a 60g sump. My return pump is a Varios 4 which I think is too undersized to serve as both a return and manifold pump. I have a separate pump I was planning on using for the manifold that will run my chiller and a reactor or 2. Any problems with placing the manifold pump in my drain/skimmer section of my sump? I would then have chiller and reactors return water to my refugium (middle chamber) before flowing into return section.