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Old 05-01-2009, 02:02 PM   #1
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180 with cracked bottom

I have aquired a 180 All Glass with a big crack in the bottom. Is it worth fooling with?

If so, is there any advice on how to remove the bottom frame without destroying it. Any advice will be helpful.

I am guessing that it is plate glass and not tempered, Right?

I have cut out old silicone and re-sealed tanks before but never replaced a piece of glass
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Old 05-01-2009, 02:08 PM   #2
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if its cracked its toast, gotta replace the sheet or ditch the tank.

Maybe a blow dryer will help soften the old sealant so you have some flexability when removing the frame. Just be gentle.
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Old 05-01-2009, 06:53 PM   #3
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If the bottom is cracked then it is definatly untempered glass, otherwise it would be in little pieces on someones floor.

Since the tank is worth $1500 or so new, it is definatly worth saving.
The big question is "Do you want to try to fix it yourself?"
That bottom glass will be about 1/2 inch thick and not easy to work with for an amature.
You might want to price out a glass shop.
If you do decide to do it, for cryin out load---be carefull, when 1/2 inch glass breaks it blows all over the place. Cover it both sides with duct tape.

Good luck
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Old 05-01-2009, 11:28 PM   #4
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Thanks, it is just plate glass and it is 3/4 and 1/2 on sides, no wonder it is so heavy. Started cleaning it up; trimmin old silicone from corners. Turned it bottom up and removed the frame. Ready to cut the bottom loose and clean it up.

now started thinking ahead (very unusual for me) what will be the best order to re assemble?

Leave it upside down, glue the bottom on, then the frame? Turn it over and then glue the inside.
or
Put the frame down, glue the bottom to the frame, then have the rest of the tank and friends ready to lift and sit on the bottom then seal the inside??

The reason i ask is that i read on here somewhere that cured silicone and fresh dosent stick good, even a hour or so old???
Im tryin to figure out when to seal the inside I assume immediatly would have to be best, or would it be ok to wait 24 hours then turn it over and do the inside?
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Old 05-02-2009, 01:00 AM   #5
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It will be easier to do the inside as a second job, even if it requires cleanup of the new silicone that may have oozed from the repair. A bottom crack can be repaired with a patch, especially if the bottom is supported with styro. The patch would be placed on the inside. This would not be preferable to a new bottom, but is an alternative.
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Old 05-07-2009, 02:05 AM   #6
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Ok, I am attemting to repair it (or create a nice reptile tank). The bottom frame came off eaiser than i expected. then the cutting of the bottom joint. I am sure I did all the no no's of tank repair. i ended up with a few chips out of the bottom edge. a couple are decent sized (see pix) but the frame should cover them. will this holde up under the pressure of 180 gallons? or is it a reptile tank?
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Old 05-07-2009, 11:22 AM   #7
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I did a lot of research on repairing tanks. Mine was not broke but I wanted to remove the old silicon because it was just plain ugly.

Probably 95% of the articles I read, suggested taking the tank completely apart and rebuilding it from the ground up.

I'm not sure about the chips.. but if I had to guess. I think it would be ok.

But I would definitely fill it outside and let it stay that way for several weeks... if not longer.. In a safe area.. away from children and pets.

That's a bunch of water and a bunch of glass.
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Old 05-07-2009, 08:23 PM   #8
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Off hand I would say it is OK .... I had an old tank with edge chips like that & there were no issues (but it was only a 75 gal). However, I would definitely test it outside before using, just in case.
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Old 05-14-2009, 02:16 PM   #9
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Hi folks. I have a couple of questions. First, I have a 125 ga tank that is 23 years old. It was always functional until 5 yrs ago. Had to empty and move it. It has never leaked. Is it necessary to reseal it? Second, I have always used a 250w heater. Now some sites are saying that's too small. Any comments on this? Thanks.
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Old 05-14-2009, 02:38 PM   #10
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Quote:
Originally Posted by Wizardndog View Post
Hi folks. I have a couple of questions. First, I have a 125 ga tank that is 23 years old. It was always functional until 5 yrs ago. Had to empty and move it. It has never leaked. Is it necessary to reseal it? Second, I have always used a 250w heater. Now some sites are saying that's too small. Any comments on this? Thanks.

In my experience, if it looks good and did not leak before, leave it alone. If it is unsightly, trim it out, clean the corners and re-seal it. Use caution not to cut too deep in the corners.

I alos have a 125 and only use a 300w heater, I do keep it near the return from my filter to distribute the heat throughout the tank.
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