bulkhead

Installing a 120g with 3 1” bulkheads on the bottom of the tank(center interior overflow). Don’t want to drill thru hardwood floors. Am going to run flex PVC throught the back of the stand, through wall, down the cavity, back through the floor joist into the basement. (~15’ run to sump from...

hello all I need some help with my return plumbing. I'm setting up a sca 50 with shadow overflow. It will be a herbie style overflow with a 1/2" pre drilled return line next to it. Below are pic of the bulk head I just got from BRS. I'm not sure how or what I would use to plumb this to my return...

So i plan to drill a 15g tank and use a 10g as a sump (small, i know). My question is are there any comprehensive guides out for this? ive look at a few threads and videos but nothing really too in depth popped up for me. my general questions are as follows: What size bulkheads should i use...