Hi all,
Normally
Cryptocoryne spp. leaves are long lasting, but they are prone to melting, particularly if they are plants that were grown emersed and then submerged. You may find that all the old leaves melt off, before new leaves grow.
<"
Slow growing plants"> (like most
Cryptocoryne spp.) are an advantage in a long term set-up, but you may need some fast growing plants in the set-up stage. One advantage of plants with a rapid turn over of leaves is that it allows you to diagnose nutrient deficiencies, particularly in <"
a floating plant with green leaves">, the reason for "floating" is just that it takes CO2 availability out of the equation.
cheers Darrel