I have used rock from a previous tank and don't know If I should bleach it or not. The rocks have some dead algae so its not clean. Do you think I should worry about cleaning?
I use old rock periodicly and just hose it off well. As far as the best bacteria keep in mind only a tiny fraction of the microbial stuff on reefs is culturable and much of the essential stuff can't be bottled. As mentioned by Spieg above wild or maricutlured live rock is the best and probably only source for microbes and sponges essential for a healhty ecosystem. This article and videos may be helpfull in understanding these complex processes better
Establishing a Healthy Microbiome in a New Aquarium Using Live Rock
Studying the effects of live rock in a newly established aquarium shows that high-quality live rock promotes the rapid establishment of an effective biological filter and a microbial community similar to those found in mature reef tanks.
www.reef2reef.com
"Coral Reefs in the Microbial Seas"
Changing Seas - Mysterious Microbes
Nitrogen cycling in hte coral holobiont
BActeria and Sponges
Maintenance of Coral Reef Health (refferences at the end)
Optical Feedback Loop in Colorful Coral Bleaching
Richard Ross What's up with phosphate"