Thanks. I'll just want to check the publication dates.

It was getting very silly when I looked at some books and saw that they
were 5 to 10 years old.

In your opinion, what would be the cutoff date for information that is
relatively current? I realize that things are always changing, but is
there some point in time, say, 3 to 5 years back, that the fundamental
technology and/or general knowledge has not changed significantly since?

For instance, if calcium reactors only came on the market 5 years ago,
then I would think that any information prior to this "milestone" would
be largely out of date.

Thanks again.

Marc Levenson wrote:
Aquarium Corals - by Eric Borneman
Reef Invertebrates - by Anthony Calfo and Robert Fenner

I'm just starting the second one, but it looks to be excellent.

Marc