Hey guys I'm new to the hobby and just bought a 34 redseamax aquarium. The previous owner gave me his water, some live rock, and some live coral (not much at all, maybe 4 little pieces of coral). I've had the tank running for a week now and all of a sudden living organisms have started appearing. Yesterday I noticed about 3 baby starfish come out of nowhere. Today I looked and starting noticing a lot of baby snails. Also, I look at the back of my tank and noticed lots of very very very small shrimp I think. They could also be little snails. Not sure, but they are very small and you have to get up really really close to even see them. Anyways, my questions is, what does this mean? Is it normal? Do I have anything to worry about? Please, give me your opinions.