Justin Boucher wrote:
You may very well have diatoms. This is perfectly normal in a newly set up
tank. They typically feed off silica as their main food source and once
that is depleted, they will die down. This usually takes a few weeks to 2
months. My 240gal just finished it's diatom cycle and we're near the end of
the die off. The rocks have their natural color back, the bog wood and
plants are all looking "normal" again. It's really not much to worry about
unless it lasts for several months. Then it usually means you have surplus
silica somewhere getting in the water (and no, the silicone adhesive is not
a source).

Are you sure the silicone adhesive isn't a source of silica in newly
manufactured tanks? I've heard both ways. Either way, I've had the
same experience - diatoms bloom and then die off any any newly setup
tank. They're usually easy to rub off of the glass, decorations and
plants like anubias and the Otocinclus will take care of the rest.

--
__ Elaine T __
__' http://eethomp.com/fish.html '__