I have an established tank (9 month old) using man made rock, 5 fish, several crabs and snails. I will buy some t-5s in the next few months for decent lighting. I have a refugium with cheato and a sand bed. The tank has 0 ammonia, nitrites, nitrates and phosphates. Now should I get some GARF grunge to populate the refugium and tank with all the little critters or should I hold off 6 or 7 months till I can start buying live rock with some coraline algea and critters or what?