I’m a new reefer I’m just starting out in the hobby. I have a 7 gal tank (will be upgrading to a 50-60 gal) with 3 turbo snails 3 nassarius snails a very very small clown fish a green coral goby and regal damsel. It’s about 2 months old. I started with 3 hermits and a serpent star a regal damsel and the nassarius snails, the star died and one hermit got savaged by the other one and then the remaining two didn’t come out there shell once and died. The ammonia and nitrite was a little bit elevated. Now all the fish are doing fine and the snails are as well. What could be the cause.