Dangers of Medicating Healthy Fish?

[Spar]

Not until you see the direct effects. Somewhat safe to say that after 3 to 4 weeks it is more likely to be (2) rather than (1). But the cyst stage is highly unpredictable, hence the wide 3 to 72 day span for that stage.

Just focus on keeping everyone healthy in the meantime. Get some Selcon to strengthen immune and general other health too.