There may be the following reasons for the red tiger head goldfish not eating:

1. Maybe the fish feed is not suitable for the red tiger head goldfish's appetite, try another kind;

2 , You can use an oxygenator to increase the oxygen content of the water, because the red tiger head goldfish will not eat when it lacks oxygen;

3. Check whether the water quality of the fish tank has deteriorated. If yes, you need to change the water;

4. Pay special attention not to feed red tiger head goldfish. Too full, it may have to stop eating and digest because it has eaten up.