Do not use gravel that big. All it is going to do is provide areas for
waste to get trapped and pollute the tank. Plus the poor little cory's that
scavenge around the bottom of the tank looking for food will not be able to
get it. Use small gravel around 2mm in size or smaller, or even sand. The
cory's will apreciate it.

btw, don't add any cory's until the tank IS cycled. Some of them can be
quite sensitive to water conditions.

--

Margolis
http://web.archive.org/web/200302152...qs/AGQ2FAQ.htm
http://www.unrealtower.org/faq