drilling tank questions.

[Scubareefman]

:deadhorse:This will be my display I drill. Just wondering how far down to put the holes for drains, back up drain and return. I'm drilling the back of a Osaka 155 if that helps. I have a med CPR overflow box so I have some idea of the hole layout, but just want advice before slicing into the glass.


Also what's a good depth to put the overflow box when I silicone it in, level with the top or an inch or two below? the tank is rimless.

cheers

 

[Chronicj7]

You want the overflow teeth to be where you want your water level to be and the holes to be in the center of the overflow box. I hope that made sense. Good luck

 

[ca1ore]

It depends a little bit on the amount of water you plan to push through the overflow, and the linear length of the overflow box, but figure the equilibrium water level will be a 1/2" or so above the bottom of the overflow 'teeth'.

 

[Scubareefman]

Great info guys thanks. I got the box in today and will be drilling the tank tomorrow. Looks like I should have room for one elbow facing downwards for the main return and one pointed up with a bit of pipe as the backup. I been looking and that seems to be the set up a lot if folks have.

 

[Scubareefman]

Drilled and ready for water test

Drilled and ready for water test

So here is the tank after the drilling. I was amazed at how easy it went. I did not think it would be that simple.