On Sat, 08 Jul 2006 04:40:02 GMT, "Bryan" wrote:

A pet store near me has an awesome show tank with no coralline on any of the
glass. On my way out a month back I asked him how he does it. He said
something to the effect that his multiple clams and other calcium absorbing
species and rocks keep the glass clean for him. I need to go back and
clarify but I thought I'd give you his info.

If you run a tank that is calcium deficient the corallines stop
growing before the corals do. A lot of calcium users kept in a system
with inadequate calcium addition will produce exactly this effect.
There is detail on this in Delbeek and Sprung Vol 3.

Steve