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Question DetailsAsked on 7/21/2015

how to repair a fishtank. 40 gal tank not holding water but no crack in the glass. How do you replace the seals?

The 40 gal tank leaks but the glass is not cracked. How do you replace the seals?

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For a single-point leak, get fish tank silicone sealant at pet/fish store, clean out the leaky area of existing caulk with utility knife or razor blade (do NOT scratch plastic/glass) and recaulk. Read instructions on length of drying time before refilling (commonly 24 horus or so) and on whether you need to flush the repair with a couple of water changes or not. Do NOT use regular silicone caulk unless you want sushi for dinner - aquarium caulk uses a less deadly solvent and lacks the fungicide in normal caulk which will zap the fish in no time flat.


Test good before putting fish back in - first repair maight not find all the leaky points, though they will commonly be discolored on the inside and show on the outside as yellowish or whitish lime deposits where the water comes out of the lea=k at the frame/glass junction.


For a significant joint seam failure, normally has to be take apart, the glass cleaned up, then the glass reembedded in sealant as it is put back together - some aquarium supply stores will do that, most probably not.


If built with pre-formed seals, those are put in as the unit is assembled and the corners silicone caulk sealed, just like sliding shower door glass seals - you would have to find the manufacturer name and contact them with dimensions for replacement seals, or call to see if they carry them and if so take tank to aquarium supply store to see if they can provide seals that will fit your glass and frame. I am sure online aquarium supply stores also sell standard sizes - will require measurement of glass thickness, and also the depth and width of the slot in the frame, assuming it is a screw-together and not permanentlhy glued type.

Answered 5 years ago by LCD




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