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Old 07-13-2014, 12:21 AM   #1
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Need to seal a hole!

I have a 225 gallon fish tank with a dual center overflow. However the tank also has a hole on either side of the tank driled into the bottom of the tank. The previous owner used the holes as return lines to get flow from the bottom. I need the best way to seal/plug them up. Can I use bulkheads? Or get a peice of glass cover the hole and silicone it down? Please help with advice. Thank you

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Old 07-13-2014, 12:36 AM   #2
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One way I did it was with a bulkhead, pvc then end cap that was siliconed. It lasted a year. But I don't know with a tank that big.


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Old 07-13-2014, 09:56 AM   #3
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After a year it started leaking on you? How bad? And did you drain the whole tank and repair it?

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Old 07-13-2014, 10:15 AM   #4
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I have a 120 and several 40b's with bottom drilled holes covered by glass. No problem just silicone around it well on both sides. I suggest laying the glass on the tank and then siliconing around it. Doing it the other way may leave some slight gaps for water to get in.
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Old 07-13-2014, 10:17 AM   #5
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After a year it started leaking on you? How bad? And did you drain the whole tank and repair it?

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Oh no it didn't leak I just upgraded! Haha sorry should have been more in depth


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Old 07-13-2014, 01:56 PM   #6
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No problem just silicone around it well on both sides. I suggest laying the glass on the tank and then siliconing around it. Doing it the other way may leave some slight gaps for water to get in.
mmmm, no, siliconing just around the edges is destined to fail in the future.

The safest way to do it would cut a piece of THICK TEMPERED glass that is at least 1" bigger on all sides than the hole, if possible.
Clean all surfaces and then lay a nice coating, 1/8"-1/4" thick of silicone over the entire patch piece and press it into place. There should be plenty to squish out the sides and down to fill the hole, which is what you want. You can easily see if there are any gaps and just smoosh the glass patch around to deal with them. Then smooth the silicone on the underside of the tank so it fills the hole completely like a plug. If you want you could put another piece of glass underneath as well.
Have used this technique a few times with no negative results.
Patched like that it should last the life of the tank.
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Old 07-13-2014, 02:57 PM   #7
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I would put a bulkhead in with a ball valve on it and connect a hose to it
you could then drain water out of the bottom of the tank where the worst water is when doing water changes
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Old 07-13-2014, 03:06 PM   #8
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I would put a bulkhead in with a ball valve on it and connect a hose to it
you could then drain water out of the bottom of the tank where the worst water is when doing water changes
That would work if they decide bare bottom.

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Old 07-13-2014, 03:08 PM   #9
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I would put a bulkhead in with a ball valve on it and connect a hose to it
you could then drain water out of the bottom of the tank where the worst water is when doing water changes

In a saltwater reef tank, or ANY tank for that matter, there should not have areas of "bad water", if so then there is inadequate water flow/circulation.
Actually water flow should be such that the bottom layers of water are continuously being circulated to the surface for maximum oxygenation.
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Old 07-13-2014, 04:40 PM   #10
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Oh no it didn't leak I just upgraded! Haha sorry should have been more in depth


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Oh lol, ok thanks

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