It's been a tough week to make progress. I was in VA for an awards ceremony over the weekend which was a refreshing break from the day-to-day stuff.
Good news is that the order from glass boxes arrived so off to drill the sump!
I marked the hole and left about 1/2" of space from the bottom edge of the tank. The return pump is going to pull from the tank inbetween the supports for the 20's above the sump.
After marking I added an additional outline along the outside of the bulkhead so that it would be easier to see where I was drilling
plumbers putty and some RO water from the fridge so that the tank feels well treated. off to drill!
I started at an angle and slipped around a bit. once I got the edge in a bit I leveled out and very slowly started drilling away. The cordless Dewalt was on low speed and the trigger was less than half way in. I let the weight of the drill do the work and patiently cut away.
as the end got near I found out that the drill wasn't as level as I thought it was. I had to straighten out a bit which is quite possibly why I still had some chip-out on the back. Nothing the rubber seal on the bulkhead can't handle. Found out that focusing on glass is tough so i went manual. pic makes it look worse than it really is.
Dry-fitting the bulkhead!
So I'm having second thoughts on the dedicated refugium. The initial thought was to keep the return area of the sump large in case the ATO fails. Problem is that i never calculated the salinity change that would go with a several day failure of the ATO. as such, in the event of an ATO failure i would rather stop the return pump and let the powerheads in the tank keep the water moving.
With this in mind I'm re-visiting moving the refugium into the sump since I have space. I would likely place the refugium on the left hand side, skimmer in the middle with the return on the right hand side.
Return water would be primarily directed into the skimmer area, with a 1/2" on a ball valve controlling the refugium area.
any thoughts?