Tetra Safestart+ worked well for me only, 14g planted tank. Had .25 ammonia, 0 nitrites, and 10-20 nitrates within 2 days. Totally cycled in 7 days. Ammonia never went above .25. Be sure to fully shake the bottle, as the only time if didn't work 100% was when I didn't shake the container. However, that was with it's predecessor BioSpira.....still, it says to shake well so be sure to!