Because the dip would alleviate the stress preventing it to eat.Dip will stress and probably kill this fish. It's weak and malnourished and it doesn't show any signs or infestation of anything. Why stress it more?
Yes, I've owned large Angels and No, I didn't have to dip them. However I've never heard anyone recommend dipping to induce fish to eat.Because the dip would alleviate the stress preventing it to eat.
No offense but have you dip large angels before? Have you owned large angels?