Paul, as coincidence would have it I'm also using JI number 3, which is making my water way harder than I was expecting (didn't realise it had lime in it when I bought it). One of the major reasons I'm planning on a rescape is so I can replace it with an acidifying soil mix.
Hi Renegade... not sure which lillies you're refering to? There are peace lillies (Spathiphyllum sp.) in the riparian planters, and Nymphaea bulbs dotted about, plus amazon frogbit and Hydrocotyle leucocephela floating about which could be mistaken for lillies I guess.
What's the name of that riparian plant that's shooting up to the ceiling? That's not the peace lily is it? The peace lilies I've seen are the ones with the white flowers and their leaves look nothing like that. Unless I'm mixing up your description?
"Space and light and order. Those are the things that men need just as much as they need bread or a place to sleep."