if you have a lot of flatworms in the display, try to remove as many by hand as possible by using a turkey baster and net. if you rely on flatworm exit to kill off a large amount they can release toxins when dying and harm other livestock. also, regarding treating the red bugs, I'd wait a week or so to avoid overstressing.
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"Try not to become a man of success but rather a man of value" Albert Einstein
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