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Discussion Starter · #1 ·
I am in the process of upgrading my 55 gallon, and bought a 92 g All Glass corner tank used on Craigslist for a really good price. However, when I got home, I found a tiny crack on the middle of the floor panel of the tank. Its only about half an inch long, and looks like it might have been hit by a rock during landscaping. The glass is tempered. Will the crack propagate causing the entire bottom to give out or is it okay to use? Is there anything I can do? I was thinking I might buy a square foot of sheet acrylic or glass to place on top of the crack before I add substrate to distribute pressure or protect it from further impact. I bought the entire setup for a really good deal and would hate to return it, even if I could. Ideas or suggestions? Thanks in advance!
 

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Carpe Noctem
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can you post a pic? Hard for me to give quality advice on this one without seeing a really good pic;)
 

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I hate to tell you but as far as I know, a tiny crack in tempered glass is only going to get worse. You could try to silicone another yer over the top of the existing bottom, but it's risky, if you got the tank cheap enough it might be worth while to get a new bottom cut and installed but without a lot of confidence in this style of do it yourself, I am thinking , too risky and not worth risking a reef tank over :(
 

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Tempered glass in the bottom of a tank can fail in a spectacular manner and if it has a crack it is past repair. be safe and replace it is my recommendation. not worth the risk of 90 gallons on the floor and dead critters.
 

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Generally tempered glass does not crack, it shatters. To tall if it is truly tempered, you will find a thread in the DIY section that will show you a really easy way to tell :)
 

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Carpe Noctem
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Well I agree with everyone else IF it is a crack. The fact that it is tempered, led me to hope it was just a scratch;) Because it hasn't shattered yet...
 

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Discussion Starter · #10 ·
I went to go take a few pictures, and it did look like it could maybe be a scratch. I rubbed it with my finger and a bit of rubbery stuff outlining the crack/scratch came off, but under it is still a definite edge. Hopefully it is a scratch because I don't think a crack would produce tangible fault lines. It doesn't look like it extends through the thickness of the glass.




Then I found another one.

<img src="http://imgur.com/HXgIQ.jpg" alt="Hosted by imgur.com" />

Crack or scratch? Should I get it replaced anyway? How much do you think it'll run me? Thanks!
 

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I would say scratch, If it was a crack it would have shattered by now into a million tiny little pieces that aren't sharp...like a car window.
 

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that's up to you. I cant give you a complete answer cause I cant see it and feel it, but if you feel safe to use it then go ahead. Another option is to go to a really good local fish store and see what one of their advanced people think :)
 

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Just because it's tempered does not mean it can not crack, tempered glass can have elongated cracks, it's just when they break the go into tiny pieces.
You have a couple of choices, replace it or if you were going to try to use it, I would suggest take it to a auto glass shop and have them vacuum seal it.
 

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Doubtful a crack in tempered glass with 3/4 of a ton of water and rock and sand would allow a crack to form and not shatter ;)
 

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Just because it's tempered does not mean it can not crack, tempered glass can have elongated cracks, it's just when they break the go into tiny pieces.
You have a couple of choices, replace it or if you were going to try to use it, I would suggest take it to a auto glass shop and have them vacuum seal it.
I'm pretty sure tempered glass cannot crack without shattering due to the high inner stresses created by the tempering process.

Sealing cracks only works on laminated auto glass. Tempered glass is not used in windshields.
 

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Agreed Vince, I've never seen tempered glass crack, only shatter.
 

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It looks like silicone from when the tank was manufactured. Take a razor blade to it and see if it scrapes off.

I would say it's safe to use.
I agree. They make a mess when they install the overflows with that black silicone. Try to remove it as suggested.
 
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