I was hoping someone could help me figure out the order of import6ance for testing for the tank????? I want to buy the hanna tester, but I can afford all of them at once, so I needed to figure the best purchase order...... I have biocube AIO 29G with a couple of clown fish, a cardinal, some snails, a sea urchin, 2 anemones and a few corals. TIA