Thanks for the comments guys. The Goldfish have nibbled the Java Fern a little, but are generally leaving it alone, I'll pull it out if they do serious damage.
The new tank is 240 litres with about 70W of lighting. I think the way I've taken the photos has diminished the effect somewhat, although I'm considering adding reflectors once the plant stocking has finished. Unfortunately, I can't go overboard because management will never stump up for uber-lighting or CO2.
We're still halfway through our stocking phase, there are more plants and fish to come, including a donation of Guppies. I'm hoping to find a good (i.e. free bit of driftwood as a centre piece, and scatter some rocks around. It's just a decorative tank for the lab (we're a school, btw), but I try and use species that are relevant to research, or biologically/behaviourally interesting.
As for advice, I'm basically learning as I go, so any constructive tips are appreciated.