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Revonok 12-21-2012 03:24 PM

Repairing tank with cracked bottom
I'm sorry if this isn't the right place, but I'm at work and couldn't find anywhere that seemed like a better place to put this.

So my friend recently purchased a very nice 30 gallon tank, but didn't realize until after she brought it home that there was a small crack in the bottom pane of glass.

I have an extra piece of glass from a 10 gallon tank I tore down, and I was wondering if I could sort of "patch" the glass so to say? I was thinking if I used enough aquarium safe silicone, maybe I could silicone the crack real good then place the extra panel of glass (it covers the entire crack + like 5 inches or more on every side) over the crack and get the edges sealed real well with silicone also.

Has anyone ever tried this? Does it sound like a disaster waiting to happen? We filled the tank 3/4 of the way with water and it didn't leak or crack anymore so I really hope it's doable, I can't afford to replace the entire bottom at the moment, Thanks.

R.sok 12-21-2012 05:40 PM

I think it is a disaster waiting to happen. But if it were me & I was set on doing this without the correct bottom panel or just to test it for the hell of it, I would use silicone & put that "patch" on top & then place something on the outer bottom on the tank. Maybe a cut piece of wood so the pressure doesn't push through the lower crack.

I am not responsible for what you decide to do in case of a disaster, this is just an idea...

Revonok 12-21-2012 06:43 PM

Thank you for the reply. I know it's not ideal but I'm hoping it will work, I guess I'll find out. I had planned to put some sort of reinforcement on the bottom side as you suggested, probably along the length of the aquarium but inside the plastic trim, in hopes it would allow the weight to be distributed more evenly.

Darkblade48 12-21-2012 07:01 PM

If you can't replace the entire pane of glass, then don't bother patching it, it is just a waste of time and materials, in my opinion.

It is also extremely risky, as the aquarium would not be any safer to use...

Revonok 12-21-2012 07:06 PM

Have you ever attempted it or know anyone who has? I'm by no means arguing your point, I'm hesitant to try myself honestly lol I've just seen a few people saying they've done this with success.

Wy Renegade 12-21-2012 07:12 PM

I hate to say it, because I also view it as a disaster just waiting to happen, but I do know some people who did it with a 125 gallon. Two pieces of glass, one above and one below, and lots of aquarium silicon and it has been up and running with a full reef in it for five years now without issue. It is most definitely not something I would do however.

JoeGREEEN 12-21-2012 07:13 PM

It can be done
Ive patched side cracks before with no problem

I think if you use a piece of at least 1/8" thick glass and patch it on the inside of the tank and then place a piece of foam (like the pink foam & NOT styrofoam) on the inner bottom you should be fine.

I would go to a local glass shop and have them custom size a glass pane the size of the inside of the bottom and just silicone that on the cracked bottom.

Just be sure to use aquarium safe silicone (Silicone 1 by GE ) and put a good bead along all the cracks.

Revonok 12-21-2012 07:21 PM

Joe, have you ever used that method for bottom cracks? It's a very small crack (maybe 2 1/2 inches) and the tank held water with the crack there, I just wanted to try and do what I could to help it not get worse. I'll keep you all informed so you can either say wow it worked or have a good laugh and see pictures of my friends ruined carpet XD

Thank god my tanks are all okay >_>

R.sok 12-21-2012 07:29 PM

My friend has done it before with a 10gallon running for a year with no disasters. he used the pink foam from homedepot, I forgot what thickness but it was slightly thicker than flush, with water poured in it leveled itself out & acted as a support.

Again do this at your own risk & keep in mind even though the crack is only 2 1/2 inches it will spread over time. Idk how much used 30 gallon tanks go for in your area but around here they can be had 15-50 used..sometimes even free which is far better than the risk

JoeGREEEN 12-21-2012 07:44 PM

This method has been done on bottom glass but not by me. (only back and side)

If your friend is desperate for a quick fix then use the glass you got from the 10G & make sure its siliconed inside of the tank and a good bead along each crack and use that plush pink foam cut to the inner perimiter of the bottom frame and place it below the tank.

and even with all this I would stress test it outside after it dries over newspaper for 72hrs , just to make sure.

Revonok 12-21-2012 07:51 PM

Thank you all for the replies and great info, it's much appreciated. Luckily I have plenty of that insulation foam board stuff on hand in various thicknesses so I'll see which fits the best and go from there. I'll keep you all posted if anyone is interested to hear the results. :]

Also R.Sok, I've looked locally online and in classifieds but apparently aquariums aren't popular around here, cause' I've found NOTHING. Lots of great stuff on AquaBid but not in my state and local pickup only lol

JoeGREEEN 12-21-2012 08:14 PM

K' goodluck and keep us posted

joefish72 12-24-2012 10:25 AM


Originally Posted by Revonok (Post 2117666)
Have you ever attempted it or know anyone who has? I'm by no means arguing your point, I'm hesitant to try myself honestly lol I've just seen a few people saying they've done this with success.

I repair and rebuild tanks and the short answer is yes it can be done. Note: There are no advantages to fixing a 30 gallon since you can buy one new at petco for $30 when they do the buck a gallon sale.

boxhead1990 12-25-2012 05:46 AM

It would be the same as putting a patch over where a tank has been drilled just make sure there's no air pockets and it will be fine chances are the crack doesn't leak anyways

hydrophyte 12-25-2012 09:14 AM

It is generally much wiser to just purchase a new tank. Thirty gallons of water can do a lot of expensive damage.

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