Nice info Tiffi it is all correct.
When they are very small (one inch) the are red for some reason... Then after one molt they're a very dark blue.... And when they get around 5 inchs they are an awesome electric blue (just like the crayfish).
They are $15 each here. All filter feeders are $15, so my bamboo was $15 along with my two vampires, but it isn't that bad when I get like $12 store credit every couple weeks from selling them hornwort....grows insanely fast.