So I've just bought a golden dojo loach and added him to my 50g and small white spots started showing up on him. I had ich in my tank 3 weeks ago and I had cured it using the super ich cure from petsmart. And the ich is only on his fins, none of my tetra's, angels or the cory have it. Should I get a small tank to put him and treat just him or do I have to retreat the whole tank? And what treatment would be safe for him?