A lot of those 'store bought' products designed to speed up the process give a 'false cycle', so it looks like the tank is ready based on reading as the ammonia/nitrate/nitrite goes up and down. The downside is that when you add animals, it will re-cycle itself with the animals in the display.
Letting it cycle slowly and naturally with a few hardy animals will give a much more stable system to introduce sharks into. Sharks and young systems don't get along too well. So the more stable you can make it, the better.
Letting it cycle slowly and naturally with a few hardy animals will give a much more stable system to introduce sharks into. Sharks and young systems don't get along too well. So the more stable you can make it, the better.