This is, in fact, the policy of ScubaBoard. Moderators are meant to either send a PM to the member whose post was edited or removed, or in the event that a series of posts have been moderated, leave a mod post in the thread alerting members of the removals and/or edits. I can't swear that in every case this actually happens, but I do know that it's the norm. In a recent thread in the Cozumel forum that I moderated, I received a number of complaints by PM that I hadn't notified individual members that their posts had been moderated. In that instance, I had made over 100 moderation actions in a single (insanely heated) thread. That's an extreme example, but sending out individual PMs when there are multiple actions in one thread is impractical, so we leave a mod post instead. In any case, notifications are part of the SOP.