Is Krazy Glue Aquarium-Safe? (Reasons Why It’s Safe)

Is Krazy Glue Aquarium-Safe? (Reasons Why It’s Safe)

Image of aquarium decorations attached with Krazy glue

Krazy glue is aquarium-safe as it’s non-toxic and doesn’t harm the fish. This adhesive instantly binds aquarium plants, corals, rocks, driftwood, and substrates. In addition, Krazy glue is water-resistant, versatile, non-corrosive, and you can use it in freshwater and saltwater aquariums.

Let’s now understand the reasons why Krazy glue is aquarium-safe.

Reasons Why Krazy Glue Is Aquarium-Safe

Krazy glue is an adhesive that won’t hurt fish or other aquarium inhabitants.

It’s designed to bind decor, objects, and pieces of equipment inside the aquarium.

Below are some reasons that make Krazy glue safe for aquariums.


Krazy glue doesn’t release any harmful chemicals in the aquarium water that are hazardous to the inhabitants.

This glue is non-toxic, aquarium-safe, and designed to be used inside aquariums.

Safe for Water

The glue remains on the surface of the object or equipment it was applied. So there’s no residue in the aquarium.

Moreover, Krazy glue doesn’t impact the pH level of the water.

Becomes Inert

Krazy glue is designed for underwater use.

It means this glue becomes inactive or inert when it comes in contact with water.

This helps maintain a strong bond between the glued surfaces.


An aquarium-safe adhesive shouldn’t corrode the metal on which it’s applied.

It shouldn’t impact the lifespan of metal objects.

Since Krazy glue is non-corrosive, the metal surfaces on which this glue is applied will not corrode and release any toxic chemicals in the water that affect your aquatic pets.

Doesn’t Leach

Krazy glue doesn’t leach or release any toxic material into the water.

Moreover, cyanoacrylate polymerizes when it comes in contact with water.

So Krazy glue is safe for use inside the aquarium.


Krazy glue works great and is safe on aquarium plants, corals, rocks, stones, wood, broken pieces of equipment, and other decorations that you commonly use inside an aquarium.

This glue is also impact-resistant and comes with an anti­clog cap to ensure it never gets dry while you are using it to bind objects.

Where To Use Krazy Glue In Aquariums?

Krazy glue used in various places in the aquarium

Krazy glue is used in aquariums due to its effectiveness and safety.

Moreover, it creates a strong bond after drying up and becomes as hard as a rock.

Below are some of the use cases of Krazy glue in aquariums.

Aquarium Plants

Krazy glue is an excellent adhesive to glue aquarium plants.

It creates a strong bond between the plant and the surface, helping the plant stay upright and firm.

You can safely glue aquarium plants to driftwood, rocks, or other pieces of wood.

This also helps you in aquascaping and creating an underwater forest.

Broken Equipment And Decor

Aquarium equipment crack over time. Krazy glue can help you to fix them.

It’s easy to apply this glue to bind the cracked parts. Once the glue hardens, the cracks will disappear as the glue fills them.

Once you have fixed the broken pieces of equipment, safely place them back in the aquarium.

Krazy glue is also versatile and can be used to install new decorations and objects inside the fish tank.

Coral Frags

You can also use Krazy glue to mount coral frags on live rocks.

This gel adhesive helps the coral frags bind firmly with the rocks to create a beautiful coral reef environment inside the aquarium.

Aquarium Rocks

You can use Krazy glue to attach two aquarium rocks. You can even glue live rocks together.

It’s best to glue the rocks outside the aquarium. You can then place them back in the aquarium once they have bonded well.

You can also create a rock structure to enhance the aesthetic of your aquarium.

Moreover, you can use this adhesive on aquarium castles, reefs, and other objects that you want to add to your aquarium.

Where Should You Avoid Applying Krazy Glue In The Aquarium?

Krazy glue is an excellent adhesive to attach or fix a variety of aquarium decorations like driftwood, plants, stones, rocks, etc.

However, it’s unsuitable for sealing aquarium walls, just like other cyanoacrylate glues.

Krazy glue will fail to maintain a seal due to the microscopic gaps it forms.

This glue also fails to bond well with foam, paper, polyethylene, Teflon, or fluorocarbons.

Like other cyanoacrylate glues, Krazy glue is ineffective in the tank areas that have flexing.

Since Krazy glue polymerizes once it contacts moisture or water, it becomes non-elastic or rigid.

Silicone sealant is most effective at sealing tank walls.

It’s flexible and adapts to tiny movements of the side walls without crumbling.

How To Use Krazy Glue In Aquascaping?

Aquascaping means creating an underwater garden that involves arranging aquatic plants, rocks, stones, caves, or driftwood into an aesthetically pleasing manner inside an aquarium.

Krazy Glue is a thick, sticky substance that doesn’t spread all over the surface.

Instead, it creates an intimate bond between the two surfaces.

Given below are the steps to glue aquarium plants using Krazy glow:

  1. Rinse the rocks or driftwood to remove the dirt and debris attached to them.
  2. Bleach the rocks or driftwood to eliminate unwanted parasites and bacteria. Then rinse them thoroughly to remove the bleach.
  3. Boil the rocks for ten to twenty minutes. In the case of small driftwood, boil them for 15 to 20 minutes and larger ones for 1 to 2 hours to remove pathogens and chemicals.
  4. Spread the rocks or driftwoods out to cool and dry.
  5. To open the Krazy glue, pierce the top of the glue with the screw-on cap.
  6. Gently take the plant out of the pot and carefully run water over its roots to clean them.
  7. Next, find the roots or rhizome (aquatic moss) of the plant.
  8. Find a suitable part of the roots to bind with the rock’s surface. Then use paper tissue or a towel to clean the roots before applying the glue.
  9. Apply a layer of adhesive on the rock or driftwood where you want to place the plant.
  10. Press the roots vertically above the rock’s surface. Hold them together for a few minutes to allow the plant to hold onto the surface.
  11. Repeat this process with the other live plants you want to add to your aquarium. Avoid delays and ensure that you complete the process in about 10 to 15 minutes to ensure the plants don’t dry out.
  12. Plan your aquarium layout and arrange the aquatic plants, rocks, and other items to mimic an underwater garden.

Finally, take proper care of your aquascaping to maintain the stunning display you have built inside the aquarium.

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