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These spots are mucus cones likely mixed with ich and a condition this fish is susceptible to. You will need to quarantine fish and treat in a separate tank. Often with this, other occupants will not show signs. Use coppersafe or Copper Power at therapeutic level 2.25-2.5 For a FULL 30 days (do not interrupt this 30 day period) monitored by a reliable Copper Test kit such as Hanna Brand- No API brand. Also monitor Ammonia levels while in quarantine with a reliable test kit and add aeration during treatment using an air stone.
I can see a sort of diffuse large spot above the bottom fin, is that what you’re looking at?