Nano reef everything dead

I've had this 10 gallon nano reef running for about a year now I contracted Ich and lost my clown fish and orange spot Gobi and lost my clown fish and orange spot goby. Now I added a turbo snail to hermit crabs in a bumblebee snail because they wouldn't be affected by the atti now I added a turbo snail to hermit crabs in a bumblebee snail because they wouldn't be affected by the ich. They have all died within a day my water parameters are as followed
Temp 77
Ammonia 0
Salinity 1.025
Nitrite .25
Ph 7.8
Nitrate 0