Thanks for that.
I'm still not sure about 1A. it has a rhizome, rather than roots, I've just wedged it in the wood. Doesnt look like any lotus pics I can find, but dont know what else it could be with those big leaves.
2A, yeah looks like Java fern.
4A watersprite looks about right.
5a yup, small amazon sword I think, although the leaves are kind of round.
5b still not sure. looks a bit like a kind of rotala maybe.
Joshua: I found a website which says "Watersprite grows better in some tanks than in others. Some people just cannot grow watersprite. Others grow it by the bucketsful." Maybe you are one of the unlucky ones, or maybe it doesnt like being posted
I have half buried the bulb, so we'll see what happens with that.