Hey all! I really really need help. I have 30 gallons tank with corals, crabs etc. Last year I lost all my fishes due to ich. I waited over 3 months before adding new fishes. I see everywhere that tank should stay 72 days without fishes so the ich will die. It was over 100 days... Now i got 2 clown fishes and a royal gramma, all went through quarantine tank and were in main display for over 4 month. And yesterday i spotted ich on my gramma! How could that happen?! And what should i do? Could ich survive in the tank? And how to treat it? As far as i know lowering salinity will kill al my invertebrates? I put gramma in quarantine tank, but should i put there all fishes? Please, any help would be very appreciated!