This is a very interesting post and it is a pity that not many has responded thus far. While I do not think I qualify to give advice, I have the following comments.
A problem that I then to find with rosette plants is that while they are stupendous as a centre piece, it is difficult usually to combine many different rosette plants to fill out the spaces in a neat manner because the space under the overhanging leaves of large echinodorus species for instance is hard to fill. unless your tank is pretty huge, it can look a bit untidy or cluttered.
The list stated are predominantly larger plants (and red may i say), except the Crytocoryne parva. Assuming that you want an entire tank using rosette plants, the parva can then form your foreground. (it will take a long time to get established) A much quicker alternative is the common E. tennellus, which gives a very textured look. A side point. Cryptocoryne species are all rosette and given patience and time, each species can develop into real beauties, even the much underrated C. wendtii, costata and ciliata.
A tank of many individual rosette plants each competing for attention would be distracting. However, if you have a large clump of one paticular species in an area of the tank, it can be pretty. Although your list do not have E. uruguayensis, I have personally seen this plant planted in dense groups at the corner of big tanks to great effect.(some of Amano books has this as well) From your list, perhaps E. osiris can be used instead.
from your list, I will, select parva for the foreground and other empty spaces. At the rear to one side, has a huge clump of A. rigidifolius with some crypts, pr A. madagascaris beneath to "soften" the stripy feel. A. rigidifolius is a good choice because it does not wither unlike most Aponogeton species. However, do not that A. rigidifolius is another slow grower initially.
perhaps, barclaya longifolia 'green' can form the focal point at the 1/3 of the tank in front of some rocks or wood. behind the wood, either E. osiris or E. horemanni. Do have a space in the middle to aviod clutter and for neatness.
hope this helps and you can have a nice tank of rosette plants. Do post some pictures when you are done! :wink:
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