How large is the tank? Easy just to empty everything out and start over. It's a young tank from what I gather so the cc should not have to much detrius in it. Save the water, take out the fish, live rock, throw away the cc, replace live rock, add live sand, slowly refill tank with water and plop fish back in. If you reuse the water and place a heater in it you will not need to acclimate the fish. Just my opinion and I did this on a 55 gallon with NO problems.