For a glass tank
100% silicone sealant
Cotton balls
Rubbing alcohol
Razor blades
Masking tape
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1
Buy the 100% silicone sealant from an aquarium store,
pet store or home improvement retailer. If you purchase sealant from a fish store or pet store, it will be safe to use on the fish tank. If you buy sealant from an home improvement store, verify the sealant is made with 100 percent silicone; it's approved by the
Food and Drug Administration for contact surfaces; and does not contain additives or fungicides that are toxic to fish.
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2
Place the
clean, dry and empty fish tank on a flat surface. Ensure the area is well ventilated due to the nature of silicone fumes. Gather all your supplies before you begin to reseal the fish tank.
3
Remove the existing silicone sealant using a razor blade. Carefully slide the razor blade underneath the seal until you touch the glass and slide downward to remove the silicone.
4
Clean the removed sealant area with cotton balls and rubbing alcohol. Slide your finger over the cleaned area to check for tackiness. Repeat the process if necessary.
5
Mask the seam areas with masking tape to be resealed. Place the tape along the lines left behind by the old sealant on the fish tank.
6
Reseal the fish tank with the sealant starting with the bottom edges. Seal one edge at a time. Dip your thumb in the rubbing alcohol and slide over the seam. After the bottom has been resealed use the same technique to repair the sides of the fish tank.
7
Allow the new seal to cure for at least 48 hours to ensure it is completely dry.
8
Fill your fish tank with water and let it sit for 24 hours to ensure the seal is free of slow leaks. Put your aquarium back together
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