I gotta give props to people who have managed to 5-box Black Morass. I tried a few times and just got spanked. I even pulled in a friend who has a Kara geared pally and use him in place of my feral druid and we did better, but couldn't get past the 2nd boss. I think it is possible, but I'm just not quick enough with reactions and popping potions, etc. This place is quite a bit harder to box than Shadow Lab, IMHO. The biggest problem I had was keeping up with healing everyone from the mobs that do AE damage.