Tank was five months old and had fish, corals, and anemones. Also, detris package. At six months, tank took spike in phosphates and calcium. Was informed that might loose corals and anemones but fish should be fine!! Ended up losing whole tank but three corals that just closed up!!! Started again, last week and everything was exactly in order. Added new detris pack on Wednesday and corals started to open. Waited and added six damsels yesterday, checked all levels. Everything was terrific!!! Woke up this morning every fish dead and corals closed again!!! But everything checks out fine!!! Puzzled!!!