If anybody still wants to know, here is a positive ID on these two plants. On the upper right is Limnophila sessiliflora, or Ambulia. Looks like Cambomba but is much easier to grow as it will grow in much lower light. Fast growing, almost weed like plant. The real mystery plant at the bottom left in the main pic and in the single pics is Ludwigia arcuata, or Needle leaf ludwigia. Gets nice red stems and leaves in higher light. There you have it. Got the info from BA oakville, both plants are for sale there now. Also on the Tropica web site.