Agreed never start over we always need battle prep and yours is certain to respond it's easy variant.
It could have been much worse strain. Next time if it grows back also can lift out rock and pour on it externally the scrub off and you'll never have algae again, I sure haven't and it's been like six yrs now. We used to be simply disallowed from acting on it then rules got broken because someone didn't want to allow it any longer, one lost tank was enough to know their rules stink