2 voices make it happen.
In the list of Public Logs, there is now a column that shows the last date and time a log has been updated. This field is updated when a log is created or edited and whenever a new fish, coral or invert has been added, a comment made about any of them, when a test has been entered or when maintenance has been entered.
To make identifying that something new has been done since your last visit more obvious, any time something has been done to a log since your last visit, the date in this column will be bold faced.
Hope this is what you were looing for and thanks for the feedback!