While many brands of aquasoils like ADA aquasoil contain a high amount of nitrogen due to being enriched with ammonia, they may not contain optimal amount of other nutrients such as potassium or magnesium. Water soluble nutrients are quickly leeched off with water changes as well. Therefore, dosing should be done once there are plants in the tank. Having good access to the full spectrum of necessary nutrients allow plants to adapt faster in new tanks.