my tank has ich need help to cure my fishes
I have a 55 gallon tank with 2 inverts (tiger cucumber fish and a spotted linckia starfish). My fishes are 1 hawaiian spotted blenny, 1 yellow tang, 1 cleaner fish, 1 hawkfish (going back to the pet shop because its chasing my blenny), 1 dwarf coral beauty angel fish, 2 clownfishes, 1 golden dwarf eel. I noticed 4 or 5 days ago my cleaner wrasse was scratching against the rocks and sand then soon after I noticed that my blenny and 1 of my clownfish is scratching, now tonight I saw some white spots on the coral beauty and my clownfishes. What do I do from here? What caused the ich in my tank? How do I treat the fishes because I have some live rock and 2 inverts in the tank. In about 2 weeks I will be placing more cured live rock in my tank. What do I do. I don't have a quarantine tank. If I do set up a quarantine tank do I need a chiller for it. Or can I just setup saltwater in a bucket and put an air stone for quarantine? The nitrate, nitrite, and ammonia are zero, and the PH is 8.0
Please help me before it will get worse and my fishes die.