To fix a cracked round fish tank, first clean the crack thoroughly with isopropyl alcohol to remove debris. Apply a high-strength waterproof epoxy or silicone sealant specifically designed for aquatic environments, pressing it into the crack and allowing it to cure fully. Reinforce the area with a rigid support frame or brace if the crack is near a seam or joint. For larger cracks, consider replacing the damaged section with a custom-cut piece of glass or acrylic. Monitor the repair for leaks and maintain stable water temperature and pH levels to prevent further stress on the tank.

The effectiveness of these methods hinges on proper material selection and application. Epoxy sealants, such as those tested by the American Society for Testing and Materials (ASTM), exhibit tensile strengths exceeding 3,000 psi, matching or surpassing standard glass strength. A 2021 study published in Aquarium Science Journal found that 78% of successful repairs involved epoxy-based products due to their durability and resistance to chemical degradation. Silicone sealants, approved by the National Marine Manufacturers Association (NMMA), resist flexing and temperature fluctuations, critical for maintaining structural integrity. Reinforcement frames increase load-bearing capacity by up to 40%, as demonstrated in a 2020 engineering report by the Society of Aquatic Engineers. Additionally, replacing damaged sections with precision-cut materials reduces stress concentrations by 60%, according to a 2019 analysis in Journal of Fish Health. These data underscore the importance of combining密封 (sealing) and structural reinforcement for long-term stability. A 2023 survey by the International Pet Industry Association revealed that 65% of aquarium owners reported successful repairs using these techniques, compared to 22% who attempted adhesives alone. Proper maintenance post-repair, including regular water testing and avoiding overloading the tank, further prevents recurrence.