I do have 3 holes in the over flow. (2) 1" and a single 1.5". The overflow box also has another hole half way down the tank for some reason. I plugged it with a 1" bulkhead and had planned on using the one of the 1" drain holes as a easy drain/fill port for water changes. I was going to plumb the drain out the back to a T - one going to my mixing station, the other, drain, out to my front yard since the tanks in my garage. I haven't gotten that far so I can still switch it up.
Overflow hole i'm talking about:
An emergency drain might be a good idea, although do plan on have Ultimate Acrylics make me a black lid for my overflow. If I go with a herbie would my 1" be my main drain and the 1.5" be the back up, or the other way around and why?
Here is where I'm at on the plumbing so far.
Left to right -
* 1.5" drain
* 1" return
t1 - ATS or Separate Display fuge (haven't decided yet)
t2- Calcium reactor
t3 - Aux but most likely Zeovit
t4 - Chiller
Going to 90 down to Sp6 return pump in far right chamber
* 1" either herbie drain or easy water change?
Sump
Chambers left to right
* ATO Reservoir
* Return Chamber/ Possible ATS location
* Equipment section - skimmer, cal reactor maybe zeo reactor
* Return pump section.
