Seam repair to a 700g glass tank.

rEd86

Premium Member
Greetings.

I am considering purchasing a 700 gallon glass tank (10'x3'x3') that has a seam that needs to be repaired. It is a fresh water tank that I will be making into a reef tank. As you see from the photo:

TankRepair.jpg


the silicon has come apart at the seam and the tank is now leaking. (it's dribbling, not pouring) The area in question is about 3" in length and is in the middle of the 10ft span.

How should I repair the split seam? I would rather not pull apart the tank, since I think I might create more problems than I am solving and the size/weight of the glass is pretty intimidating to be handling that way, even for someone has tackled a lot of do-it-yourself projects.

Should I attempt to clean out the bad area and inject it with silicon again? I was thinking I would just load up the seam with a LOT of silicon and cover the repair with the trim of the stand so you couldn't see it. I've read that new silicone will not adhere to silicone that's already cured so will loading it up only solve the problem short-term? I just don't know if the seam splitting is an indication it's going to continue - I would hate to have 700+ gallons of salt water on my office floor if I don't repair this properly! The tank is less than 2 years old so I am hopeful that the seams in general are in good shape.

Suggestions?

TIA!

--Ed
 
With a tank of that size the only way I would repair a seam would be to take it to a professional tank builder.

Once you remove one pane of glass the others alot of the time also have to be removed because you do not put new silicone over old silicone. A disaster waiting to happen.

No way id attempt that myself.
 
MY buddy tried repairing his 300gl that way worked well for a week than saltwater all over his floor. The whole front went out on him.
 
id take it to someone qualified in working with glass, and fish tanks would be better. The only way i can see you fixing this is by removing that piece of glass, dress the seams with fresh silicone, after removing the old and reapplying the piece of glass. After that period, id add a strip of glass 5 inches in width, 1 inch think and the internal front to back length of the tank, to act as an internal brace. Basically more bonding room for the middle of the glass to hang on to.
 
Thanks for your input.

I would love to take it to someone qualified to repair it, I just don't know who that is! :) (not something you can easily look up in the yellow pages) I would think a aquarium builder would need to be local since the cost to ship the tank out and back would be too much. If you know of anyone in the greater Cincinnati area, let me know!

That’s an interesting idea of adding the extra strip of glass to give more bonding surface. I am not sure about needing to go 5" wide. With the silicon adhesives these days, I would think anything over 2" would not add any additional strength. Anyone else have some thoughts on width requirements?

--Ed
 
idk how important the width would be either, but something there on top of the bottom plate to add additional center support would help with bowing pressure, and help keep a good hold of things.
 
<a href=showthread.php?s=&postid=13920462#post13920462 target=_blank>Originally posted</a> by Tc269
MY buddy tried repairing his 300gl that way worked well for a week than saltwater all over his floor. The whole front went out on him.

Agreed. No way I'd settle for anyone less than a pro to do this job. Good luck with the tank.
 
that needs to be totally redone, the seam between the panes of glass are your strength. you cannot just cover it up with new silicone. if you are getting it for super cheap then maybe because transporting a glass tank of this size is VERY VERY HARD TO DO.
you might need the repair guy to come to your house LOL.
not worth it IMO
 
Gotta love the big tanks with "room for improvement."
I currently find myself with (4) yes (4) HUGE acrylic tanks all in need of a little love (buffing, polishing, cleaning, etc.) How do we know when the monster is about to eat it's maker?
Best of luck!
The office below you may be concerned about that seam as well...
Did you need to speak with your city engineer about an extra 6 or 7 thousand pounds upstairs?
I admire your courage!
 
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