DrTim's Aquatics One & Only Axolotl Live Nitrifying Bacteria is the axolotl-specific version of Dr Tim's classic bottled-bacteria starter — formulated to instantly cycle a new axolotl tank in 24 hours and to rescue an existing tank from ammonia or nitrite spikes. Real, pure-cultured Nitrosomonas and Nitrobacter bacteria — the same species that establish in a fully-cycled biofilter — bottled and ready to seed your filter the day the tank goes wet.