I am new to the hobby. My tank finished cycling about 3 weeks ago. I did a small water change but I am not sure how often this needs to be done. I monitor the water conditions and they seem to be fine but I feel like I should be changing the water soon. The only things I add to the water is food and purple-up. Also, my pump seems to be sending out air bubbles. Is this going to be a problem? If so any suggestions?