Hi new Reefer here, 50 gallon salt water tank, 2 clowns, 2 damsels, 2 cardinals and a goby. Have a few corals, green star, zoas, duncan. So far so good, about 6 months in and learning alot. The only issue is my phosphates are kinda high 1ppg and nitrates are 10ppg. I do 20% water changes every 2 weeks.. I have a HOB Seachem Tidal 55 and a powerhead with good flow. Any suggestions