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Not to beat a dead horse, but I will share my personal experience. I had a similar issue with some drains in a previous tank setup. I had purchased the system used and the previous owner had drilled/plumbed it. There was some silicone in a similar fashion as yours with a larger elbow siliconed over the threads of the bilkhead. My thought was "there wont be any pressure on a drain, I'm sure it will be fine"
Wrong... A few weeks after I set up the tank, I noticed tons of salt creep forming in that area and down the back of the tank. Upon closer inspection, the carpet behind the tank was wet. It was slowly leaking.
Worst part of the story is that I had to tear the tank down just to get it away from the wall to allow for the repar. When I redid it, I used a street el (sp?) and never had another issue.
Sorry for the long post but I hope it helps.
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McLovin for president
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