Tools for your planted aquarium
Forceps and so on:
The non-locking type of forceps/hemostats are easier to use
but are hard to find in the longer lengths. The shortest length that works for your tank is the
best size to use. The shorter they are, the thinner the
jaws, which make for easier planting.
Testing kits, etc
You don't really need anything beyond a pH tester, in order to figure out CO
2 levels.
http://www.spectrapure.com/St_quality_p1.htm are higher quality ones, apparently (I haven't tried them myself).
Acknowledgements
Thomas Barr's article on tools