opportunity for marine aquarists to obtain new and unique corals while limiting the impact on the natural environment. Rare species and those without a history of being successfully kept in captivity should be avoided. Commercial development Various businesses have commercialized fishkeeping. With the advent of large scale business operations focusing on breeding massive quantities of specimens, marine fishkeeping has become much more widespread than ever before. Perhaps the biggest disincentive to marine fishkeeping, in comparison to freshwater, is the initial setup cost. A reef tank full of coral and equipment can cost in excess of $2,500 US, although a budget-minded home hobbyist could spend less than half of this and still get a satisfactory result. References Further reading Advanced Marine Aquarium Techniques, by Jay Hemdal The Conscientious Marine Aquarist, by Robert Fenner Invertebrates: A Quick Reference Guide, by Julian Sprung Corals: A Quick Reference Guide, by Julian Sprung Reef Invertebrates: An Essential Guide to Selection, Care and Compatibility, by Anthony Calfo and Robert Fenner Aquarium Corals: Selection, Husbandry, and Natural History, by Eric H. Borneman. Natural Reef Aquariums: Simplified Approaches to Creating Living Saltwater Microcosms, by John H. Tullock A History of Tropical Marine Fishkeeping in the United Kingdom 1960-1980, by Gerald Jennings, John Clark, et al. External links RTAW Reefpedia, a Reef Keeping wiki maintained by the Marine Aquarium Societies of Australia Reef Hobbyist Online, a Reef Aquarium electronic magazine with articles written by expert marine aquarists Marine FAQ, Frequently Asked Questions on general marine tank housekeeping Synthetic Seawaters for Aquaria and Laboratories, Calypso Publications (1979) The International Marine Study Society IMSS formerly the Marine Study Aquatic Society of the United Kingdom MSAS,(1966-1970) , A Guide to Produce Your Own Water To Drink Fishkeeping Articles containing video clips