Azoo is an abreviation for azooxanthelate corals.
What we are refering to here are corals that do not require photosynthisis to live, or NPS corals (aka non-photosynthetic corals)
Some of the easier nps corals would be suncorals or dendrophyllia.
Some of the more difficult corals would be seafans or dendronephthya.
These are just some exapmles and there are lots of corals that fit into this catagory.
All of them though will not survive in the long run without a specialized feeding regime and that is what this manual is outlining.
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