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In tank treatment is never advisable.
If you using this for ick you be better off removing fish from the DT and do a treatment in a QT.
Let the display with corals and inverts fallow of fish for at least 76 days or longer.
It’s not for white spot, this is useless against it.
Do you know active ingredient(s)?
Correct.
I’m not even sure we have it here in the US.
All info I found was in the UK
Ingredients are
Malachite Green
Acriflavine Hydrochloride
And formaldehyde as a a stabiliser
Ideally, you wouldn't want to dose your display, but if you must you could try a smaller dose to see how things react and make sure you increase aeration as all 3 deplete oxygen.
Your fish will be fine, as far as corals and other inverts I can't say. What are you trying to treat?
My last in tank treatment for fish issues I purchased from this guy 42.5 years ago
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