single cell algae.

http://www.indiana.edu/~diatom/diatom.html

Diatoms are unicellular algae generally placed in the family
Bacillariophyceae. The cell walls of these organisms are made of silica,
and the varied shapes and beautiful ornamentation of these walls made
the study of the diatoms and related siliceous organisms a favored
pursuit of the microscopical pioneers.


Peter Pan wrote:
Can anyone explain to me in simple terms what Diatoms are. I tried to
google it, but the site are all checical this or chemcal that. Its beyond
what I know.
Thanks
"rtk" wrote in message
...
I've developed a nasty case of brownies. I think it's just a
coincidence that I opened a new bag of salt, same company.
No new anything in the tank. I tried an inch of fine sand on
top of the old, but that didn't stop anything. I change 6
gallons of water per week from the 55 gallon tank. Here's a
pic with a few details:

http://www.personal.psu.edu/faculty/...wSal****er/Sal
****erID.html
I'd appreciate any suggestions. It is seriously ugly.

rtk