how cold is your tank getting ?

[Europhyllia]

That's interesting since I figured you'd be a big Bob Fenner fan. ;)
The Conscientious Aquarist says:
Most tropical systems and organisms do best between 74 and 80 degrees F, optimally around 75 degrees for most. The real key in terms of temperature is stability.

Based on that to me the 74 degrees would have looked pretty good (without the swing). I am keeping mine 77-80 mostly because I know I wouldn't be able to keep it below 77 consistently

[corruption]

But -- the book is written as a very generalist summary.... its dependent on the fish we keep, and the vast majority of marine species available are used to warmer temperatures... that also encompasses 'cold water tropicals' in Bob's statement -- things like the Catalina Goby

Like I stated as well -- the key IS stability... keeping swings within a point or 2 per day is prime, if you can balance this, then most else is simple

-Justin

[corruption]

Another thing that Bob will readily state is that the book was written many moons ago, and things have changed since even it was written -- based on my time on WWM, his recommendation tends to hover in the 76-80 range depending on species for marines..

-Corruption

[Europhyllia]

based on my time on WWM, his recommendation tends to hover in the 76-80 range depending on species for marines..

-Corruption

Excellent. I am right there then - maybe I'll add a heater to the fuge for a smaller swing

[jlh81]

yeah that much of a drop is too much mine was going from 74 at night to 78 durring the day so i put a heater in about 76 seems to be working great