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Old 06-07-2011, 01:55 PM   #21
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If it was my tank I would get a piece of glass about 6 to 8" wide, enough to cover the crack and silicone it in . I would not replace the bottom frame but would set it on a layer of styro. The local Big Al's has a shark tank that is 4' x 8' x 3' tall that has a cracked bottom that was repaired with a patch. the tank holds in excess of 700gallons. Somewhere on the net is a pictorial story about the building of a 16 ' long tank that has 3 pieces for the bottom.
I have been waiting for someone to post something saying that they've seen successful patches in large tanks. I really appreciate the input, I think I'm going to give the patch a shot and just let the tank sit with water for a few weeks before I put any fish back in. Gonna get 1/2" glass, I figure I'll get a piece about a foot wide to cover the crack plus some.

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I just bought a 250 gallon tank that was cracked along the bottom. what i did was get a custom peice of tempered glass allready drilled where the overflow and return were and cyliconed it right on top of the cracked glass. i also put a bead of cylicone along the crack.only hard part scraping the old cylicone off along the bottom that sucked because it was such a big tank.
Nice save! Any pics of the tank?
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Old 06-07-2011, 02:07 PM   #22
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This is kinda off topic but the aquarium in the dubi mall(2 million gallons I believe) had a panel of glass that cracked and sprung a leak.....makes u think that a 180gal is not so bad compared to that lol
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Old 06-07-2011, 04:06 PM   #23
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So I called a few local glass shops... 1/2" glass is literally almost 3 times more expensive than 3/8". I was going to buy a piece 16" wide, so it would just go from the side wall of the tank and out over the crack (Which is about 8" from said side wall). It will run $72 to get 1/2" in a 16" by 23" piece and $25 for same size in 3/8". Would it be more logical to stack both pieces of 3/8" on top of each other and silicon them in for less money, or better to just get the 1/2"? Or would one 3/8" piece probably do the trick?
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Old 06-07-2011, 04:25 PM   #24
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IMO I would get a new tank or fix the bottom the right way by replacing the whole glass u don't want to come home to 180 GALLONS of water on your floor and all your fish dead do u if u do use a patch you must think about this it is more unstable than the original and if u had a problem before and don't find and fix it next time u may not be so lucky
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Old 06-07-2011, 04:27 PM   #25
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If the bottom is supported. the thickness of the patch glass would be of little concern. For example, if the bottom were sitting on a solid surface stand with a layer of styro beneath it the thickness of the patch would be of little consequence.
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Old 06-07-2011, 04:31 PM   #26
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All the fish tanks I've ever seen sit on a rim because the center area is weaker that's y they have the plastic around them and y the stands in stores have a lip so that the weight is on the proper area the strongest area
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Old 06-07-2011, 04:35 PM   #27
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If I remember correctly all-glass even offers a 5 year warranty if u buy tank and stand together so they know that u have set it up correctly so if it's a allglass with stand under 5 years I would talk to them
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Old 06-07-2011, 05:02 PM   #28
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IMO I would get a new tank or fix the bottom the right way by replacing the whole glass u don't want to come home to 180 GALLONS of water on your floor and all your fish dead do u if u do use a patch you must think about this it is more unstable than the original and if u had a problem before and don't find and fix it next time u may not be so lucky
I'd love to, but this is just not cost effective for me at this time. I understand what you are saying though. I have a couple of things working to my advantage: 1) My tanks all sit in my garage (heated in winters), so I'm not worried about possible floor damage, all water would run right down into the drain in the middle of the floor. 2) I have all the fish safely relocated right now, and they can stay in their temporary 55 for a few months without being cramped. I will leave the tank filled with water for at least a month after the patch for testing. Any leaks or anything and the fish don't go in.

I think that a patch is a feasible option if there is substantial support underneath the glass from the stand w/the styrofoam buffer, and I'm going to attempt it. Will I ever have 100% peace of mind while there are fish in it? Probably not. But the ocell and mono peacock bass will eventually outgrow it anyway and I'll sell it as a reptile tank when it's time to upgrade to a "big time" tank. Just need it to last me a little while until I can afford larger. If I get any leaks or additional cracks then the thing is either sold as a reptile tank sooner than intended or just scrapped.
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Old 06-07-2011, 05:22 PM   #29
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All the fish tanks I've ever seen sit on a rim because the center area is weaker that's y they have the plastic around them and y the stands in stores have a lip so that the weight is on the proper area the strongest area
This may be what you have seen, but your conclusion is wrong. If the center was weaker it would have to be supported. The center is raised up to prevent breakage from you sitting the tank on a piece of gravel. Most custom tanks, especially large ones have no trim, especially on the bottom. Those that do have add on pieces rather than the one piece frames used in standard tanks. The commercial tanks stands are basic frames that support the tank at the four corners. the cross pieces do little but hold the stand together. With the open center, there is no risk of you placing the tank on something hard like a stone that might break the bottom. In addition, the stand is simpler and cheaper to make; it doesn't make it better, only sufficient.
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Old 06-07-2011, 05:47 PM   #30
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If the bottom is supported. the thickness of the patch glass would be of little concern. For example, if the bottom were sitting on a solid surface stand with a layer of styro beneath it the thickness of the patch would be of little consequence.
You have been a big help. What kind of styro do I need to use? I.e., if I walk into Lowes/Home Depot and someone asks me what I'm looking for?
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