I basically did what this guy did:Sorry to heard about your fish lost .
I have a question about your Carx. I have same exact one without PH probe holder. Did you buy Reef Fanatic Probe? What type of drill bit did you use and what size? Did you glue it to the lid? I am thinking about modifying mine too.
http://www.reefkeeping.com/issues/2009-03/diy/index.php
It was not as hard to tap the thread as he described. I bought a neptune pH probe to add to my apex, and a brs in-line probe holder:
https://www.bulkreefsupply.com/probe-holder.html
But it might be cheaper and easier to mail the lid to Geo and have them do it for you. I called them and they said they were happy to, and the price was less than everything I paid to do it myself. But I just wanted to do it myself.
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