Chooch, the subtropical tank is attached to my main reef system that runs between 77 and 79 degrees... the subtroical tank runs in the low 70s... sometimes during the winter in the high 60s... You could read about it in my TOTM article from last year...
http://reefkeeping.com/joomla/index.php/current-issue/article/76-tank-of-the-month
This portion of my article explains it best...
"One thing I always tell people is to buy fish that excite YOU! When we're new to the hobby many of the commonly available beautiful fish fulfill these desires. However, after having been in the hobby for so many years, and having seen such a great quantity of fish, one's interests and excitement often shift from the usual to the unusual. Such is the case with me. One trait common to many of these fish that are considered "œrare" in the industry is that they are collected from cooler waters. This can be due either to being collected in deeper water in a tropical climate, or in a subtropical locale. I've noticed in my many years of fish keeping that a species that naturally exclusively occurs in cool water in the wild will require those same temperatures in captivity to thrive long-term. When kept in appropriate temperatures, these species that I once considered "œhard to keep" were dramatically easier. I now believe that while there are many species that are "œhard to adapt", there are very few I'd consider "œhard to keep" when the right conditions are given. With that in mind I wanted a cool water tank without having to add a whole new system and all of the required extra maintenance and equipment. How was I to accomplish this?
Running nearly 3000 watts of light on this system, I regularly run chillers. I set up the 70 gallon with a closed loop driven by a Pan World 50PX-X that feeds through an AquaUV 57 watt sterilizer and two 1/3 HP Teco chillers, set to run between 68 and 72 degrees depending on the time of the year. I then fed the tank from my main system at a rate fast enough to allow enough water exchange for life support, yet not so fast that the temperature equalized to that of the main system, which runs between 77 and 79 degrees. This rate worked out to be about 20 gallons per hour, resulting in the exchange of the tank's water volume about once every three to four hours. I have this slow feed travel through an AquaUV 25 watt sterilizer as a precaution in case there should ever be a parasitic outbreak in my main system. Again, I cannot overemphasize the importance of strategically placed UV sterilizers in preventing pathogens from becoming a problem. Additional flow is provided by an Ecotech Marine Vortech MP10. These pocket sized pumps are outstanding and provide a surprising amount of controllable water flow for such a small pump. The tank is lit by a 6 x 24 watt T5 fixture and is mainly populated with SPS corals. The focus is on the fish however, so I'm placing corals that could both withstand the temperatures and the propensity for coral munching."
Again... I love this species!
Thanks,
Copps