i cycled my son's aquarium in 6 days. i used the tetra safe start and added anacharis, java fern, onion plant and a big red tiger lotus from my goldfish tank. didn't see any spikes. looked today and got 0 ammo, 0 nitrite and 5 nitrate. the tiger lotus sent up floating leaves two days after. the move didn't effect it. if anything the extra indirect sunlight really helped. it has 7 floating leaves now.as far as the tetra, wow! the product worked well. but it's still cheaper to seed the tank, if you have the means to do it. but think of all the fish this could potentially save. and all the frustrated first timers this will help. it became easier to be successful. i just can't believe it was so fast. however, this is my individual experience/opinion.