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PRO - NITRO CYCLE FORMULATION CAPSULES - THE LEADING AQUARIUM BENEFICIAL BACTERIA 100% natural and organic with no harmful chemicals, safe for all live-stock. Suitable for Established or New Freshwater, Planted and Marine aquariums. Microbac is a special formulation of beneficial bacteria, enzymes and micro-organism consisting of more than seven major bacteria species and strains ( aerobic and anaerobic type ) like yeast, nitrosomonas, nitrobacter, photosynthetic bacteria, and a special strain of beneficial bacteria. Advanced encapsulation methods allow the bacteria to be packed in