RadaR
The things we do for our fish..
Having 1 wont light up the whole of the tank. However having 2 placed along the back should suffice.
The concern is that the sunlight will be too much, so you'll get algae on the glass. Still, I really like your tank, you're riccia looks brilliant.
looks good. where did you get your shrimp? in falkirk?
on the plant/shrimp deah thing, it's most probably the copper on some of the plants that you added. I would always wash and rinse new plants before planting them.
greg