Cutting internal overflow for lower water level--Anyone done this?

[da_great_one]

Hello,

I am setting up a 75 gallon tank for my RES. It's an Oceanic reef ready tank that I found on Craigslist. I also purchased a 120 gallon wet/dry filter that I was planning on using for filtration. The problem I am having is the internal overflow is obviously made to have the water level to the top of the aquarium, and I am needing the water level to be significantly lower. I thought about taking the existing box out and making a new one, but from what I have read they are almost impossible to completely take out. I also thought about just drilling 2" holes all the way around the existing overflow at my desired water level and covering them with some sort of netting.

Has anyone ever cut down an existing overflow? Should I take this to an aquarium shop and see what they say? I really want to get my turtle into his new aquarium and this is the last obstacle I am facing. Any suggestions or ideas would be greatly appreciated!

I am attaching some pictures of the aquarium I have. These are just pictures I found online, but it's the same tank.

[Cliff]

I have never found myself want to lower the level in the tank before.

You could drill the hole on the largest side of the internal overflow. You would also have to cut down the standpipe to match the new hight as well (If you are planning to use one or already have one).

This might be the best option incase you ever want to sell the tank or change the purpose of the tank in the future. You could just silicone a pc of glass over the drilled hole and replace the standpipe and it would be back to its orginal waterline again.

If you are handy, you can drill the hole yourself

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I hope this helps