I began a new 120 gal saltwater aquarium July 9th---very slowly and patiently. The end of August we introduced a Coral Banded Shrimp and a few snails. They did well so a couple of weeks later we added an Emerald Crab and a "?Sallie?" Crab , starfish, fire shrimp with 6 small "cleaner shrimp" and a Lawnmower Blennie. Everyone did well until around Oct 9? Our water continued to check out well so we introduced a pair of yellow watchman gobies, another shrimp gobie-(?forget the name-beautiful though-red striped with high dorsal fin that was yellow), 4 "nemos", and a foxface. Initially 3 of the "nemos" died within 3 days followed 2 days later by our oldest resident the lawnmower blennie. The 3 shrimp gobies did well and looked well and then last week we lost all three separately within a 5 day span. The gobies never looked ill. Does anyone have any ideas? Our water has been checked out repeatedly, we have already had a 25% water exchange, etc. Someone suggested that it could be the coral banded shrimp killling off of the gobies. Also we have lost 5 of our 6 small cleaner shrimp. The fire shrimp is doing great! Any ideas would be welcomed! Our beginning coral are also doing well and look great.