questions on test kit. i have been using a friends test kits, i want to get my own but need to know what i should test for.dont want to buy tests for things i dont need to monitor. i plan on keeping soft corals and fish only. i have been using Salifert Test Kits, testing (po4, ca., alk, mag,) api kits for (ammo, Nitrite, Nitrate). do i still need all of these? or can i cut some of them out considering i am not keeping sps, or lps?