yes, and it wont create a mini-cycle, what's going to change (maybe) is the pH of your tank. i cant remember if it raises it or lowers it, but i think it lowers. i know when i made DIY rock for my 14 gallon it increased the pH in the tub it was in. it was super high and i had to leave it in the tub while changing out the water every week for close to a month before it was safe to use