I curently have test kits for ammonia, nitrites/trates, phosphates, ph, & calcium. All perimeters are stable. What else is nessasary to test for? If my ph is stable, is it nessasarry to test alkalinity? All my corals are growing and have nice colors. There is no algae in the tank at all. No bad algae or coraline. I never even have to clean the glass. They sell a ton of test kits, I'm trying to figure out witch ones I need to buy.