Yeah, those are the pods in the bottle. I personaly haven't used them though. I've heard some people breed them in a seperate bottle and add them occasionaly, though I think that is mainly for people with manderins and gobys that feed on pods. I know they're suposed to be valuable for your sand bed.
You may find also an added benifit to adding your CUC gradualy is you can customize it to your tanks needs. It's hard to find an exact formula for how much of what to get because everyone's tank is different and has different needs. If you notice you have a certain kind of algea growing you can add some CUC to target that, and your CUC will be specificaly tailored to your tank. You may find you don't need as much CUC as people say too, saving you money.
On emerald crabs, I have had one for maybe a month now and have not had a problem at all with him. I've read the "good kind" has red elbows, and there is a carnivorous kind that is bad which does not have red on the inside of it's elbows. For this reason, I would only buy one of them in person so I could make sure I am getting what I want. (picture of the red elbows)
