ways to add a sump

[bmaz123]

hi i have just setup my saltwater aquarium, i currently have two black oscellaris clownfish and a coral banded shrimp. i am running a cannister filter but have been reading up on the advantages of having a sump. just wondering if there is a way to drill the glass without tearing down the tank? also i was advised not to go for a hang on back style overflow system and would like to avoid them if possible. any and all responses will be greatly appreciated

[onsan]

drop the level and drill through the sides.

[GinaReef]

drop the level and drill through the sides.

I did it this way. It's a little nerve racking, but I practiced a bit on a small cheap used tank. Use diamond hole saw. Use water (spray bottle) for cooling and lubrication. Go slow.
I couldn't hold the drill steady enough, so we took a piece of wood, cut a large 45 degree notch in it and clamped it to the glass to use as a rest.

[bmaz123]

so if i drill it without emptying it i have to drill into the side of the glass and not the back?

[EasterEggs]

Do you have room behind the tank to get a drill and bit back there? If so, you can drill the back of the tank. There MAY be more risk of breakage drilling a tank with water in it, I don't have the kahunas to do that. I've only drilled empty tanks.

[Scottt]

I drilled a 90 while full on the side with the 'drop the water level below the hole' method. If I had wanted the hole on the back, I think that would have worked too. The worst part is really really hoping it's not tempered. If it is, you're completly screwed. I also agree, sounds like an increased risk of breakage if full.

[bmaz123]

ok thanks guys, im planning to empty and drill, just for peace of mind