Does it need to be labeled as a saltwater tank or is a freshwater kit fine?Based on size of dots and coverage- It is ich and I would not rely on a bucket which is limited to light, filter abilities and and ability to provide hiding, etc
As simple as a starter kit from walmart has most of the essential needed for QT and will pay off in the long run.
Treat with 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.
The display tank will have to be kept fishless (FALLOW) for 6-8 weeks to assure the existing parasites go through their life cycle without a host fish and die off