tomorrow i'm getting a new 55 gallon tank. I have two penguin 180s without biowheels (im planning on getting biowheels if i end up using these filters). I'm also considering getting a canister filter. I also plan on getting a couple of powerheads. I'm also getting about 20-30 lbs of liverock from my biology teacher. How much more liverock should i have? what kind of sand should i get? would regular playsand with a layer of argonite sand on top work? Should i just go with a canister filter instead of the penguin 180s? How long will it take the tank to cycle? Whats the best way to cycle it? do i need a protein skimmer if i have good enough filtration and surface movement?