Plumbing question

antegeia7

New member
Hello ledgends.
After a good break for multiple reasons (including stress and sadnes) i m back jn the game.
I was left with just a pyjama fish in my 300l cube :-(. But hey here we go again!
I have a question about plumbing. This tank is hopeless. I look fw to getting into my new home to upgrade and get rid of it.
So I m sick of adding daily RO manually and I want to utilise my ATO.
The issue i had before and I stopped using the ATO is that for whatever the reason no matter what, more water that it should was sent up from the sump to the main tank. The result is to emptying the ATO constantly resulting in disasters of rapid salinity drop adnnd flood. In an effort to avoid this from happening i try to create an emergency drain. But (yes the hopeless tank) doesn't have any room for it! So if I change the top of the drain pipe as per pics having 2 wholes, will this work?
Any foreseen issues?
Cheers in advance!
 

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