I suggest the 60w if you want to have more than just Java fern. 40w is low for that size tank.
Then, you could pick up some regular Flourish to use 1 or 2 times a week. You really don't need more than that with that lighting.
__________________
*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
|