While I realize this isn't a saltwater forum I think the same principles apply. Here is what I'm looking to build and hoping some of the experts could give advice. Setup: 4 - 6: 40g breeders 2-3 on each rack One large sump/refugium connecting them all together All of the tanks and sump will be on the same wall in a concrete slab basement So here is where I need advice. 1. Drilling tanks : how difficult is it 2. Plumbing: I have experience using PVC and cementing it together but I have no idea about width of pipes for intake and drain 3. Stand design: I'd like to use wood but want to make sure it's going to hold the weight and also hold up to up top salt water tanks I'm sure I'm missing something but that info would get me started. I appreciate all advice in advance. I've never had a setup like this but it's a dream in the making.