Hi guys, I've got fairly high lighting on my tank and have not yet dosed any macros. I think I'm lacking in one or more of these, causing me some issues with algae, particularly cyano. Just wondering what the best methods are of testing various water parameters, in particular nitrogen phosphorus and potassium. I have test strips that give me the pH, nitrite/nitrate, gh and kh so i'm assuming i can get the nitrogen levels from the nitrate readings (I've just learnt I can also get the CO2 level from pH/kh). What about phosphorus and potassium? What are the methods available for testing these? Do you guys think it would be worth it to invest in an electronic reader? And lastly are there any other parameters I should be testing? I do dose flourish for micronutrients and also have a thin bottom layer of laterite. Thanks, any help appreciated