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Red blotches are a sign of a bacterial infection. This might stem from aggression, but I’d be pulling it to treat in a hospital tank along with looking at my tank parameters.
No. Never treat in the display.
Most medications contain copper, which will leach into the rock.
I would use multiple nets and patience, even though the nets could get tangled in a tangs spines.
With that said, there are multiple tangs now?