In article , David J. Braunegg wrote:
We got our first aquarium four weeks ago--10 gallons, 2 Corys, and 2
Platys (male and female). We put two clumps of cutting plants in at the
two-week mark. The Platys decimated them.

Our platies pretty mercilessly attacked one type of our plants, and left the
other entirely untouched. After a while they now leave it alone too, so you
might find that the problem goes away.

-Paul