So my new Roma 240 is fully cycled as off yesterday (yay). In the last couple of weeks I have been adding a few plants to this tank. The java ferns have taken to the new tank and have grown a lot. They look really healthy. The java moss on the other hand has grown a bit, but was suffering quite a lot from hair algae. Things seem to be improving in that department, maybe because the filter has started to do its 'thang'.
Last week I bought some vallisneria on the basis that it definitely likes hard water. However, I've now realised that most of the plants have absolutely tiny roots of about 1 cm long

It's difficult to plant them without burying the white crown. I'm thinking of wrapping the roots in some wadding (white fluffy stuff used for sewing padded blankets etc) to make it easier for the plant to stay in the substrate and actually grow some proper roots. Has anyone tried anything like that?