You need to do water changes every week just like in a fish tank, add some oxy weed as well, and perhaps something to break the waters surface, like a sprinkler just going a little perhaps.
We have both those and they were both sold to us as chain sword grass, I planted some in the front of our new 850 yesterday and I noticed the differences.
I always wanted to work for DOC as a ranger when I was a kid, We used to visit Mt Bruce a lot and it just seemed so cool. Never quite got there though.....
There's always Dairy Farming........not really conservation related, and the environmental bit irks me a bit.