just added 10 cpd to my 10 gallon with a dwarf gourami and 4 mystery snails. has an ac20 with cycled media in it, heated at 78/79 and I did a wc before adding them. I temp acclimated and then slowly added aquarium water to their bag and then took them out of that water and netted them in, this morning all were accounted for, and when I got back from school, I found one on the intake missing eyes and half a tail, and another pinned down by a snail. I tested water again and 0,0,60 so i'm assuming they were there most the day. did a 30% change about 4 hours ago, all are fine, and eating. I know my stocking is a little weird but i'm hoping to move out 3 snails once they get bigger. aqadvisor says i'm at 94% and have plenty of filtration. i'm bring the deceased fish back along with a water sample to my lfs I got them from (I had to order them specifically) and hopefully they still have some left to replace them. what could be causing the deaths? stress?