I have around 100+ nurii rosen of different colour morphs in tap water (gh 6 kh 3 ph ~7.1); and i've been trying to get some of them to grow in my various blackwater aquariums (this doesn't mean the water is black it just means the ph is around 5 and ec is around 22 - that is tds 11); the plants melt fairly quickly - after a week or so but it never seems to regrow. While some of the tanks are shaded the last one i tried is well lit. This is one of the plants (not moved) - i believe it is maiden or something like that - i have some called pink line and some called green something or other but i think they are all the same basic species: