Underwater gardening

The water has cleared considerably over night. It still has a brownish tinge but I don't think it is tannins. I think it is the effect of the paint with the water taking out the reds, leaving a brown -which is actually what we intended! So all good so far. I have had a brainwave too, triggered by the snorkeling yesterday and the aquarium plants we bought. Have you heard of Takashi Amano? I have one of his books from my aquarium hobby days. Here is a link  http://www.adaaust.com.au/gallery/gallery.htm I don't see why I can't garden specifically for viewing from underwater (snorkeling) and try to achieve a landscape like Amano's but on a bigger scale. And I can also see that the water will be clear enough that my underwater landscape would be quite visible from above on our deck. So I am looking for an attractive log or root buttress to submerge over the filter area. From my aquarium days I know this needs to be wood from a stream or lake so that it is already waterlogged and will sink, and has no softwood left to rot. Alternatively it can be Australian hardwood which is heavy and will not flat, and which has lost its sapwood so will not rot. This can then be dressed with small plants. I think any fish in the pond would like this area and gravitate there, further enhancing the underwater view. I wondered whether the low nutrient water will sustain such luxuriant growth of the small plants? Ralf says I need oligotrophic and mesotrophic plants (favoring low nutrient conditions)such as vallniseria and potomegaton species. Perhaps I should change the name of this blog to "Beryl's natural swim Aquarium"! Today the dragon flies were mating and laying in the pool, and there are frogs calling tonight. There are still a couple of inches to go with the fill - so pictures tomorrow.