Wow, thanks a lot for the hints, guys. I have yet to learn the full battle, we always wipe in that phase, not because of me not holding aggro on the slugs, but people eating the Acid Rain. >.< I noticed that I usually lose aggro on them, that's why I was thinking that I was doing something wrong. I'll ask the healers to not make explode their heals during the pre-slug phase. Also, I'll post my feedback after our practice tonight, if there's anyone having the same issue here.

Thanks again!