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The most common reason for a male goldfish to be digging a hole is breeding behavior. Male goldfish will often dig in the substrate (gravel, sand, or other material at the bottom of the tank) to create a spawning nest.
Your tank needs to cycle first, which means growing beneficial bacteria that convert toxic ammonia into less harmful nitrate. This takes 4-6 weeks with the fishless method. Add pure ammonia (Dr. Tim's Ammonium Chloride is the easiest source) to bring the level to 2-4 ppm.
As we can see from the illustration, Indications Of Imminent Goldfish Tank Cycle Completion has many fascinating aspects to explore.
