drilled tank

[firedan]

hello all I am setting up 320 gal from 180 I have running now with outside overflow box. My new tank I am for sure doing internal overflow but unsure what is better holes out the back or out the bottom of the tank

 

[ColoReefer970]

hello firedan back might leave more water inside in case something goes wrong
bottom bored better be bulletproof

 

[Shanet]

In Australia the only tanks I've seen have the bottoms drilled, it makes it very easy to have it up against a wall and leaves clean lines and no pipes to get knocked/broken.