Oh, the other question you asked was about the sump on concrete and a chiller. I actually took my chiller out of the setup as my room stays at a perfect ambient 78. There's enough water to dissipate the little heat the pumps put out so I got super lucky in not needing a chiller. I've kept it but never in the last three years needed to use it. You might consider setting up a ghost run of just water and pumps through some buckets or whatever to see how the heat holds/dissipates. It might save you some bucks and trouble!