You could get a phosphate test. It comes in handy sometimes. Another you might want is general hardness and carbonate hardness (GH/KH)....they come in a kit together. I think thats about it really. And you won't use those all the time, but it is helpful to have those when trying to diagnose problems.
__________________
*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
|