I have a nano reef... 30G tall tank. I'm keeping only mushroom corals, green star polyps, clove polyps, a torch , maxi-mini anemones (3) a pistol shrimp, red legged hermits crabs, a watchman gobie, a six line wrasse and two clowns are the inhabitants. Aside from the obvious nitrate, nitrite, ammonia, PH, and phosphate test is there anything else I need to test for? I should add I've recently begun using store bought RO water. I see BA has a 25% off sale on API tests...