I've had Part 1 for almost two weeks now and am still discovering things. Yesterday I was re-scaping, moved a rock, and wow - discovered a nice brittle star for the first time. Haven't seen this guy before, was a nice zebra color. Still am impressed. I'm almost ready to order Part 2, and from what I've been reading, it's better than part 1! I can't imagine, I'm freaking geek'ed!