If there is a crack in the glass of the fish tank, I personally suggest that you directly replace it with a new one, otherwise even if it is fixed with glue, it may burst one day, which is too dangerous.
If it is because the glue has cracks and leaks, it will be well solved.
Preparation tools: a plastic bucket (where fish are temporarily stored), an art knife and an aquarium hose.
The first step is to find the vulnerability and mark it.
When there is water in the fish tank, the leakage point is still easy to find. Make a mark first.
Step two, pump water.
Pump the water from the fish tank into the prepared plastic bucket and leave the fish here for a while.
The third step is to repair the water leakage.
Clean up the leaked glue with a utility knife.
If there is alcohol, apply some alcohol to disinfect the gap.
Add new glue and let stand 1 day.
Step 4, put the water and fish in the original tank back into the tank.
Fish farmers know why they use the water in the original tank, so they don't explain much.
Pay attention to cleaning the glue, scrape it with a utility knife, and add water after the new glue is air-dried.