I just feed him the other day, but i had an other idea of what might be wrong. Last year we went on vacation and left my tank at a friend of my dad who also owns a saltwater tank, but does not like to feed frozen foods. So, my nems went a month with noting to eat(had a different BTA at this time) and when i got home his tentacles weren't very sticky and he would not eat. He die 2-3 moths later:( i think something similar to this happened this year when we dropped off the tank. when i tried to feed him yesterday,he only ate one small missis shrimp because his tentacles weren't sticky
If this doesn't make any sense, tell me and i will ex-plane