After testing 9 major manufacturers I have come to conclusion and its posted in a very lengthy forum here on R2R under "bacteria in bottle myth or fact"
Fritz Turbostart 900 worked with anything I threw at it including leaving it in a garage for 3 months.
Dropped 8-10 ppm ammonia to 0 in a 5g tank in 2-3 days.
Dr Tim and Bio Spria also work but a a day or 2 slower.
Rest all I tested also worked fine but needed carbon source to kick start cycle.
Only 3 that worked well in sterile tanks was definitely number 1 if Fritz Turbostart 900 then Dr Tim and Bio Spria.
On thing I noticed is tanks with sand and rocks will cycle faster than bare bottom.
Also dropping a pinch of fish food helps cycle a little faster as it adds carbon source to the equation.
Fritz Turbostart 900 worked with anything I threw at it including leaving it in a garage for 3 months.
Dropped 8-10 ppm ammonia to 0 in a 5g tank in 2-3 days.
Dr Tim and Bio Spria also work but a a day or 2 slower.
Rest all I tested also worked fine but needed carbon source to kick start cycle.
Only 3 that worked well in sterile tanks was definitely number 1 if Fritz Turbostart 900 then Dr Tim and Bio Spria.
On thing I noticed is tanks with sand and rocks will cycle faster than bare bottom.
Also dropping a pinch of fish food helps cycle a little faster as it adds carbon source to the equation.