Ok, I just got a 30 gallon aquarium set up. It's my first journey into the world of saltwater aquarium keeping, and I'm reeeeeealy lost. And I don't even know where to start. I'll give you the lowdown on my tank. 1.)I have about 15 pounds of live rock in the tank 2.)I have a good amount of sand 3.)I have 2 hermit-like crabs 4.)My salinity is about halfway to full strength seawater 5.)I have 1 550 powerhead 6.)I have a backpack filter meant for a 55 gallon I don't know my nitrate, nitrite, or ph levels, And I don't even know where to start on what I should do next. Any help would be greatly appreciated. P.s: I'll try to get pics up as soon as I can.