If I were you, I'd do kind of what I did. I have a 75 gal tank, and I got their 30 gal package. Then I filled the rest of my tank with Fiji and base rock. The rock you get from them is absolutely beautiful. People still point at my TBS even though all the rock in my tank is purple now. I've had it in my tank since February, and it still has bright yellow, orange, blue, and white sponges on it. In moy opinion it is absolutely worth it to put some in your tank. As far as hitchers are concerned, they are usually only an issue when people get the larger packages. I didn't recieve one Mantis in my package, and only had 2 gorilla crabs.