I’ve had my 65gallon aquarium running for about 6 months. My tank has been through some ups and downs, but recently I thought it had stabilized. Unfortunately, I don’t think that’s the case. It keeps getting so dirty, I do water changes every 2 weeks like clock work, my water parameters seem normal, I even brought my water in to my local aquarium shop to get tested and it came back all normal. I can’t for the life of me keep this tank clean. The sand keeps getting so dirty and I don’t know how to clean it. The glass also keeps getting dirty, and I’m constantly cleaning it. Is this normal? I just keep seeing tanks with white sand and I’m wondering how I can keep it like that?