Help with figuring out how to plumb this tank

AC0DX · Jan 3, 2020

Help! I am getting this 180 gallon tank. It was setup as a closed loop in a previous life. The shop where I am getting it from sent me these pictures of how it is drilled. What I need help with is figuring out what each hole is for. As near as I can tell, all these holes are behind the overflow, except the two toward the bottom and middle of the over flow. I am trying to figure out if I want to use it as a closed loop, or not. Help is greatly appreciated.

Mastiffsrule · Jan 7, 2020

Evening,

Sorry we missed this. I have not run across that set up. Would have no idea how the begin. Those 2 holes are are real mystery

anyone else?

Silent · Jan 7, 2020

The hole on the back glass and the hole in the middle of the overflow seems to be for the closed loop. Guess they just wanted the input or output to be somewhat hidden on the overflow.
The 2 extra holes in the bean animal looking set up might have just been drains going to other dedicated equipment like a fuge or even another tank that gravity feed into the sump. Really hard to guess what someone else might have used it for.

AC0DX · Jan 7, 2020

I think the two extra holes where returns maybe

Silent · Jan 8, 2020

AC0DX said:
I think the two extra holes where returns maybe

I don't see any other holes in the sides of the overflow so I don't see why there would be returns in the drain section. Doesn't make sense unless there is cut outs at the top of the overflow that the pictures do not show where returns would be placed. Something like picture in next post.

Silent · Jan 8, 2020

AC0DX · Jan 8, 2020

Silent said:
I don't see any other holes in the sides of the overflow so I don't see why there would be returns in the drain section. Doesn't make sense unless there is cut outs at the top of the overflow that the pictures do not show where returns would be placed. Something like picture in next post.

Here are a couple I was able to take the other day at the store.