Ok, so they are all generally mussids, which explains why I can't yet tell the difference between micros and acans, but get the difference so far betw. them and blastos.
Though then there is the difference among acan types, echinata, sub echinata, lords, "aussies", muks, etc.
I'm going to start a section for these in my tank, hopefully I buy the right thing, though I'll probably only buy from folks here. I hate feeling that I;m paying the wrong price...or being unsure what is a 'fair price' or a 'good deal'.