How to seal a drilled plex aquarium? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 04-06-2015, 03:44 AM Thread Starter
Algae Grower
Join Date: Feb 2015
Location: Seattle, WA
Posts: 33
How to seal a drilled plex aquarium?

I drilled two 1.5 inch holes in each corner of my 100 gallon acrylic tank to accept the bulkhead fittings. I am now choosing to not use them and the sump and want to go with a canister filter (long story) instead.

What would be the best method to seal the bulkhead cutouts? I could either install the bulkheads and cap them from the back or....should I go to a plex shop and install (weld) a small round or square piece on both sides to cover the holes?

I have a nice 3d background so either way it will not be visible, I just want the best leakproof solution.


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post #2 of 5 (permalink) Old 04-06-2015, 04:04 AM
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You could just hook up the canister filter intake/return through the holes.

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post #3 of 5 (permalink) Old 04-06-2015, 04:40 AM
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Location: Newmarket, Ontario, Canada
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I needed to close a hole used for SW wave circulation, and capped a bulkhead. It has never leaked. But I consider it an eyesore (but you said you have a solution for that). I suppose if the tank is ever used again for reef the bulkhead will come in handy again - and for you the tank can be used for a future sump if you use capped bulkheads.
I have no experience with welded acrylic to compare options.
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post #4 of 5 (permalink) Old 04-06-2015, 01:12 PM
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I'd suggest capping them also.

It just gives you options down the road, and with an acrylic of that size it becomes a selling point with the SW crowd if you ever choose to sell it.

It actually becomes less "leak-possible" without the plumbing dangling from the bulkheads, so I wouldn't sweat over the the possibility of a leak.

If you really want to cap them, a simple square of acrylic from one of the box stores that's 1" bigger in diameter can easily be crazy glued (Gel) in place. You really don't need Weld-On for this.


"Why can't my wife see all of this stuff as an investment?"
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post #5 of 5 (permalink) Old 04-06-2015, 08:50 PM
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Cap the bulkheads.
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