around a week ago, I added a betta fish and a platy to my tank (no quarantine). The betta was first stressed but is now acting normal, but still has a stress stripe. Yesterday, I see my Harlequin rasbora upside down. I took it to a small 1 gallon tub for now until I set up the Quarantine. This morning I woke up and another Harlequin rasboras is missing its back tail and one eye (Still alive). My old platy now has a sunken stomach and its fins are clamped. What do I do? All I have is ich X and Aquarium salt. should I separate them?