Tank drilling question

[fr82go]

I would like to add a second hole in the bottom of my 90G DT for a Bean overflow. This may be a stupid question, but since there is already one hole there is it safe to assume that it is not tempered and OK to proceed with drilling the second one?.

 

[fishgate]

Not necessarily. If the maker drilled it they may have tempered it after they drilled it. Especially if they are bottom drilled holes.

 

[ghatter]

Also, not to be overly picky here but you need 3 holes for a Bean overflow, so you'll need to drill two unless you're tank has two corner overflows with a single hole each.

 

[cryptic_grower]

I would throughly go through this thread.
http://reefcentral.com/forums/showthread.php?t=1541946