overflow hole placement

[Anonymous]

i was just getting my act together to head to the glass shop and have my new tank drilled (90g) when i realized i wasn't sure exactly where i wanted to drill it.

i usually see the bottom drilled in manufactured units. is this preferable to the back on a tank this deep? i do see acrylics drilled on the back with smaller overflow boxes. would this be better?

 

[LFS42]

I have drilled the back of all my tanks.
It takes up less room inside,
but uses more space between the tank and the wall

top corners IMO

 

[the Wizard]

And if one chooses to drill the back of the tank where should it be drilled? Near the bottom, and near the edges? Or just a few inches below the water level? Where would the professionals drill it?

 

[LFS42]

I drilled 2" min from the edges
I have
1 tank that has (1) hole drilled on the bottom corner
1 tank that has (1) hole drilled on the top corner
1 tank that has (2) holes drilled on the top corners for drains and
(1) hole drilled in the top middle for return.

(I think Sea madien remembers that post )

I like the top holes better
(no stand pipes)

 

[Anonymous]

I drilled 2" min from the edges
I have
1 tank that has (1) hole drilled on the bottom corner
1 tank that has (1) hole drilled on the top corner
1 tank that has (2) holes drilled on the top corners for drains and
(1) hole drilled in the top middle for return.

(I think Sea madien remembers that post )

I like the top holes better
(no stand pipes)

what about noise?

 

[LFS42]

The last tank has (2) 1" bulk heads w/strainers (500 gph on a 37 gal)
3/4"flex tubing
the ends of the flex tubing are placed into 1-1/2"pvc that drains into
my sump. (the flex line fit snugly into the elbows)
I did have the flex line just drain into the sump, but the noise was
terrible. I found that the PVC gave just enough venting
to quite it down quite a bit.
The only noise I hear is my pumps running.
I did put noise reducing foam inside the cabinet to reduce that noise
as well.

 

[Anonymous]

I emailed AGA about the drill patern on a 72 gal bowfront. I also wanted to know if they would do custom drilling. (They won't)

Here's the reply I got:

The hole placement is:
the 1 3/4" hole is 4" in from the back, 2 3/4" in from the side of tank.
The 1 1/2" hole is 2 5/16" in from the back and 4 13/16" in from the side of tank.

That's where it is on a 72 bow. It may just be the same on a 90.

HTH
B

 

[LFS42]

AGA won't do custom drilling
the hole placement is the same on the 90 as well (standard overflow)
but all I did was drill the back and put a pvc albow on it.
(only lost 1 fish so far)
I don't like how much room is taken up on the AGA overflows.

 

[Anonymous]

in case anyone finds it to be problematic, i am planning on drilling the bottom and putting the overflow in dead center along the back.

i think a 1" bulkhead on each side of the center divider should do.
i dislike the corner overflows because i don't really wann see what is going on back there all the time. this should be fine, right?

i am leaving to do this soon.

 

[LFS42]

Only problem is if the bottom is tempered.

other than that, no problems

make sure holes are at least 2" apart (edge to edge)

 

[Anonymous]

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