Yes the ich is in your tank. If you don't have corals, you can actually hypo the tank. You can drop the salinity to 1.008 in your tank. Leave it for 3 weeks after all spots on the fish are gone. Your rock and sand will die, so you can keep some in a bucket with a power head and change water every so often. You could also set up a quarantine for the rock some sand and the corals you have. If you put a filter pad from your tank into the quarantines filter you won't go through much of a cycle at all. There is a lot of bacteria on the pad or sponge.
150g. Honeycomb grouper, yellow tang, niger triggerfish, orbiculate batfish, black edge moray, and huma huma trigger. Green star polyps, gorgonian, toadstool, goniopora, anthelia, and torch.