Cracks in tanks? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 08-11-2019, 03:31 PM Thread Starter
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Cracks in tanks?

Has anyone here ever had issues with getting a small crack in a tank? Recently in a 55 gallon that I have, I noticed what looks like a large scratch at the bottom. And even though it doesn't go all the way through to both sides, on the side it is on, it goes all the way underneath the silicone. This was a tank I was recently water testing. Would something like this be considered a hairline crack?

Also, in a recent 40B I got from the DPG sale, I noticed a big line coming from the silicone was well, but this time, the part that meets with the silicone actually has silicone attached to it. I am quite nervous that this is a crack as well. I'm not entirely sure how it would have got there, but it's been there since day one apparently. I thoroughly inspected the tank when purchasing it and didn't notice it then. I plan on trying to see if it comes off with a razor blade. Could it be possible this was just a long line of stringy silicone that's barely noticeable and that's why I didn't notice it?

I can provide pictures if needed. Suggestions? Thoughts? The 40b can easily be returned/exchanged if I need to.
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post #2 of 7 (permalink) Old 08-11-2019, 04:32 PM
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I often see thin stringy silicone on newer tanks that appear to be a tiny crack so check with a razor blade or your finger.

Sometimes it is difficult to see a pic of a crack but you can always try to post the one for the 55G especially if it is empty of water as you can rotate the tank to double check for cracks.
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post #3 of 7 (permalink) Old 08-11-2019, 04:36 PM
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Agreed, easy enough to determine if it's a string of errant silicone. If the 55 is cracked -especially on the bottom, I would not fill it up inside of my house for love or money. That's a disaster waiting to happen. It might go 3 years and it might go 3 hours without leaking, but it's all but assured to at some point.

Nothing good happens fast in an ecosystem.
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post #4 of 7 (permalink) Old 08-11-2019, 04:57 PM Thread Starter
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First pic is 55 gallon. Second two are 40b. Sorry the best I could do. My camera on my phone blurs when it gets close. I believe the 55 is a crack more than the 40B, because it goes underneath the silicone where as the 40 does not. And I had also accidently slammed the tank on the stand when I lost grip of it recently.
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post #5 of 7 (permalink) Old 08-11-2019, 06:58 PM Thread Starter
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Suprisingly enough, they were silicone streams in both tanks! Boy am I lucky! Took a razor blade to both and they both came right off!
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post #6 of 7 (permalink) Old 08-11-2019, 07:48 PM
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Whew. I was about to say that looks more like a scratch or silicone form the photo, but would never declare such a thing with any certainty without seeing it in person. So glad that worked out for you! I think those tanks may have been assembled on a Friday.

Nothing good happens fast in an ecosystem.
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post #7 of 7 (permalink) Old 08-11-2019, 09:29 PM Thread Starter
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Well, the 55 gallon is a Marineland and their tanks are usually top notch! I could see that more with the 40b that I got from the DPG since they seem to be lower quality.
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