Test every day.
*If nitrite is still above 1 ppm 4 days after you last added ammonia, add just 1 ppm then test every days again till it is below 1 ppm
But if nitrite falls below 1 ppm before the 4th day, add 3 ppm and test next day. If both ammonia and nitrite are zero 24 hours later, the cycle has finished. If nitrite is not zero after 24 hours, repeat from * until you do reach a day where both are zero 24 hours after adding 3 ppm.
Add the Dr Tim's. It won't harm and it could well help.
*If nitrite is still above 1 ppm 4 days after you last added ammonia, add just 1 ppm then test every days again till it is below 1 ppm
But if nitrite falls below 1 ppm before the 4th day, add 3 ppm and test next day. If both ammonia and nitrite are zero 24 hours later, the cycle has finished. If nitrite is not zero after 24 hours, repeat from * until you do reach a day where both are zero 24 hours after adding 3 ppm.
Add the Dr Tim's. It won't harm and it could well help.