A hairline crack is a tiny cleft that sometimes develops on the inside or outside of the glass. It can most often be found at the bottom, edges, and in the front of the aquarium.
The repair steps are very similar to repairing cracked aquarium glass and they are:
- Removing pets, plants, and decorations from the aquarium tank,
- Draining water from the tank,
- Applying aquarium safe silicone sealant,
- Drying.