Carey- They come on LR, hitchiker essentially, if you see little white/clear "bug" like things crawling on your rock and glass, then you most likely have pods
Pat- A 75 with about that many lbs of rock with a decent sized sump should be good
And from what I've looked at they are not cheap, like around $100. And like you stated there are some that just don't stick to the prepared, if it were me, I'd just make sure I have a large enough tank to support it so if it doesn't eat prepared it'll be fine