Finally got my 135 gallon. will be doing a fishless cycle. Using pool filter sand. Have available for cycling,plants,rocks,gravel,driftwood from existing tank which I will sell after set up is done. Should I,A:use any or all of above to recycle,B: put existing gravel under pool filter sand.Cut spunges from existing filter under sand and just forget it? I know it's a lot of questions but I want to get this right. Thanks,Mogens