Trim of my fish tank is leaking. Can you use super glue on outside of fish tank?

  • 3
    You can't stop a leak from the outside. Commented May 29, 2019 at 16:39
  • Either use silicon based glue or battery compound (this is black in color, you need to heat it before applying).
    – kiranvj
    Commented Jun 17, 2019 at 5:05

1 Answer 1


Common super glue is actually harmless to use on an aquarium, but it might not yield the desired result.

This article describes why super glue is safe:

Super glue is safe for use in fish tanks because it becomes completely inert when moist or wet. The main active ingredient of the glue is Cyanoacrylate. When in contact with water it forms strong and stable bonds. Essentially, it polymerizes in 30 to 45 seconds. Cyanoacrylate is by definition an aquarium safe glue, as water is an accelerant (or catalyst) of the curing process.

The drawback is that superglue is brittle and might crumble with pores and tiny gaps that let water leak anyways.

However, It will be brittle and it will leave small gaps, which does not make it a good sealant.

This exact property results in it being applicable to small areas only.

Though it is an aquarium safe glue for decor, it’s only good for certain types of decor.

To seal a leak you probably have to use aquarium-safe silicone because it stays flexible and can adapt to tiny movements of the side walls without crumbling.

  • 1
    +1, but maybe the OPs first language is not English, so a research may give no suitable answers? May you give the search term of your Google request? (So one could learn to search oneself?) Commented May 23, 2019 at 7:49
  • @Allerleirauh I entered "super glue aquarium" into the Google search and got "Is the Common Super Glue Safe for Use in Aquariums?" as the first result. The same test in German: I entered "Sekundenkleber Aquarium" and got "Vergiftung Fische akut vergiftet - Sekundenkleber?" (fish acutely poisoned - super glue?) as the third result, which comes to the same result that the fish were not poisoned by super glue.
    – Elmy
    Commented May 23, 2019 at 8:37

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