Blue Regal with ICH!

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All good.

Going through something similar. Added a Regal to an established system that hadn't shown ick in something like 4+ years. After about six months noticed a few spots on the Regal then which cleared up in a few days and nothing since (been ~2 months).

Was and still am a little torn if I should pull the tank apart to get the fish out, place in a QT with the risk associated or let things be (which guess I'm sort of doing).

Still kicking myself for not quarantining from the start. All the hassle to treat for the whole tank compared to the minor effort of setting up for one fish.