Hello all my fellow reefers out there. I've got a question for you related to SPS corals and dosing. I have a 135 gal mixed reef aquarium with a lot of SPS corals. I had it up and running for about 18 months with good sucess. I use Red Sea Pro salt mix and use my dosing pump to dose B-ionic 2 part alk/cal. I also dose Acropower. Do I need to supplement vitamins, strontium, iodine, potasium or other trace elements? If so, do I need to test for them first and with what test kits. I've read a lot of them are inaccurate or hard to get an accurate reading. Any advice you can give would be appreciated.