About your Aponogeton ulvaceus - the flowers are actually self-sterile, so they won't reproduce in your tank (unless you can cross it with another unrelated plant). Some other Aponogeton species will reproduce that way, but not the ulvaceus. Now that is has flowered, it might go dormant in a few weeks. Don't assume that it's dead - this is normal. Just leave it alone and if it feels like it, it will resprout in a few months. Gorgeous plant though, probably my favourite.