Plumbing my Tank

[diatom]

Hello all again,
Well I found out that I don'thave to drill my new (to me) 125 Gal, it's already done. However 2 of the 3 holes are on the bottom about 1/3rd of the way in from each side and half way between the front and back. I am assumming that these are to drain into the sump. The question I have is as there are no over flows what direction should I take in plumbing this. My thought is to bring some PVC pipe back into the corners then up, burying most of it in the sand. Does this make sense? As for the return I am thinking about just brinig it up over the top asthe third hole is in an even more random location. All three holes are currently covered by a piece of glass siliconed into place and don't leak as of yet anyway.
Thanks for your time,
Brent

 

[q]

If I were you I would put another seal on the other side of the tank to make sure that this sucker deosn't leak.

 

[kodi]

I went the route with a used tank that had holes drilled (in all the wrong places) but no overflow box. I just used PVC (over to the corner and up)and a strainer at the top at first. Found that the design sucked to much air all the time causing a lot of noise and bubbles in the sump. The tank was already setup so I lost the option of fabricating an internal overflow. Hindsight, I would have done this and suggest you do this before setting the tank up.
If its too late, you can do what I did - I used a piece of 4" PVC (thin wall), drilled a flat end cap to accept a piece of the same size PVC I was using for the supply line, and installed couplings on both sides of the cap joined by a short section of PVC. After the glue dryed I measured a piece of 4" to the overflow height I wanted plus 1/4" and then notched all around the top edge with 3/16" vertical grooves about 3/4" down from the top (just imagine what a standard overflow box looks like). Inside the 4" insert a piece of drilled or slotted PFC into the coupling. The concept is the same as for a reef ready tank - water is skimmed off the surface flowing into the PVC mini sump and as the water level rises it flows into the drilled (strainer) PVC down to the sump. The PVC isn't the hottest to look at and I would have preferred something darker in color. But after awhile it should be covered in coraline anyways. LOL

 

[diatom]

Thanks Kodi,
Right now the tank is just holding tap water, making sure it doesn't leak so I think I'll take your suggestion and plumb in an overflow...I think I may be able to buy one from All-glass.