I started my tank few months back with Marco rocks and live sand. The tank is up and running for few months. It went through the regular cycling process. I did dump a couple bottle of Bio Spira to speed up the cycling process. I am noticing red slime over the rocks ... Wondering is it normal for Marco rocks ... I am running GFO ... Might use red slime remover ... but would like to know if this is a extended cycling ? Thanks