I log all my dives, good or bad, then be sure to write comments on what made this dive not so good so you can refer back to it for future dives, so that you hopefully don`t make the same mistake again. As for a dive needing to be a certain BT or depth, I would still add it, but just not count it toward your total if you are working to accumulate a specific number of dives for advancement. Just sand, where were you, Redondo?