I bought a conch a week ago, it buried itself within an hour of being released and I haven't seen it since. Algae hasn't been touched so I know it's not coming out at night. Now my nitrates are slowly rising. I went from 26ppm to 32ppm in a week. Concerned that I may have lost my conch. Am I overreacting or should I look for a dead conch? My nitrates and phosphates up to this point have been going down.