alex, watcha using for the flatworms? i used 'flatworm exit' and it was amazing, those suckers started craoking in minutes. i sucked a bulk of them out beforehand with a siphon of mini airline tubing, then sucked the floaters out after treating. i forgot to add some a week later, and had some straglers, but one more dose and they've been gone! you probably already know this, but just in case, thought i'd toss my couple cents...