another question, if i put fish in my tank after it has cycled with the 11lbs of LR in it, i have to cycle the new LR if i add some later in a seperate place before putting it in right?... i have a big 33 gallon rubbermaid tub i can use, but my question is do i need to have lighting on the rocks for them to cycle in the bin, i know i need to have a powerhead to create flow, but i wasn't sure about lighting