I started up my sons biocube last week bought that sand that says you don't need to cycle the tank but waited about 3 days before I put stuff in I put lr from my tank into his so it was already cured and I put that in when I put in the sand couple days later I put in 2 yellow tail damsels and a cleaner shrimp and some various snails after the fist day one of the damsels was dead I didn't really think much of it cause it looked like it had ich and the other damsel was looking fine couple days went by damsel was still good so I went and got 2 red scooter blennies some more zoas and a mini maxi green anemone and had my water tested and everything was fine this morning when I woke up all the fish were dead, all the coral look fine shrimp and snail are all good any ideas?