When I received the clams,one of them appeared dead and 2 of the others looked really bad.They also had pyramid snails.I removed the snails and put them in a bowl of the phyto feast mixture.The dead one appeared to be alive,so I left them in the bowl for a few hours,before placing them in the tank.The next morning they all had improved.I kept up the daily bowl feedings every day for about 2 weeks,and they all made a complete recovery.I still do the bowl feedings every other day and they have great mantle expansion.I have used DT's and Knop KORALvit F in the past,but never got results like this.I will only feed Phyto Feast from now on.