interesting ... it was the blue ones we bought that melted away really quickly.the blues are tought ones, from what i have heard they were from deep in the water so im guessing they need minimal light, i have some blues with yellow frills growing very slowly, they are on my substrate, although they are hard to keep a good color with and grow veryyyy slowly, im talking grow from 1 up to a two frag plug size in two years :D
stop touching it, every time you touch it delays it ;)