Drilling a tank

[Der_Iron_Chef]

Are you talking about a HOB overflow box or an external overflow?

[Kabong]

I would not reccomend using your current bi on that thick of glass.
Your going to need a lot of water flowing over the area to keep it cool.
So your abrasive compound would keep washing away.
If you dont mind waiting a bit, My best suggestion is to order a proper diamond hole saw bit.
You can get them pretty cheap off ebay
http://stores.ebay.com/THK-Diamond-Tools

[skylord]

You might want to talk to J&L....they told me it's $30 to drill a tank.

[Tangman]

I have had tanks drilled at Crystal Glass in Langley it costs $15.00 per hole

[Farrmanchu]

IMO an external overflow box is the way to go. It doesn't take up tank space. You can use the Dremel bits to notch out the top edge of the tank, whatever length and depth you need (depending on amout of flow). Eggcrate or Mesh covers the "notch", it functions the same as an internal overflow, with no risk of syphon loss that can happen with a HOB overflow. I'll try to find a good link.

[Chaotic Cricket]

Originally Posted by Farrmanchu

IMO an external overflow box is the way to go. It doesn't take up tank space. You can use the Dremel bits to notch out the top edge of the tank, whatever length and depth you need (depending on amout of flow). Eggcrate or Mesh covers the "notch", it functions the same as an internal overflow, with no risk of syphon loss that can happen with a HOB overflow. I'll try to find a good link.

Yes I would agree, I noticed at gold aqauriums, I believe was the name (first time there the other day. I am new to this neck of the woods. I talked to someone (I think albert?) he showed me an overflow design that looked quite nice, external with eggcrate on it. Perhaps he would be able to post some pictures to give you an idea. It was quite a nice design. If you search on Reef Central (haven't checked here sorry) at one time at least there was a lot of posts on "calfo overflow" think that is what you are searching for. If i find some pictures i will put them in this thread. I don't "do" reef central much anymore. Mind you the calfo overflow's that i have seen are inside th tank, but i like the theories behind it very much.


http://reefcentral.com/gallery/showp...t=1&thecat=500
http://www.maast.org/modules/gallery/dow/aag


If you are particularly gutsy you don't have to drain your tank completely to add one of these either (I would personnaly). I have a few old friends that did something similar without draining their tanks, though they had a ot of stuff laying around to be used if something went wrong. But all told you would only need to keep the tank drained for max of 24hrs, make the overflow box vbefore installing, then you just need drill and silicone it in and wait for it to cure.

[Farrmanchu]

http://www.reefcentral.com/forums/pr...hreadid=502320
Here's one, I guess you still need to drill a hole or two in the bottom of the actual box. But from what I can tell, this guy did it all with Dremel.