Just run reef octopus bio sphere , mine dropped from 100 to zero in 2 mths. Keep em topped up. And placed before a skimmer. These balls are basically solid carbon food sources. Same concept as vodka and sugar dosing.but much easier. I change like 10% water every 6 to 12 mths just for the fun of it. Bioload one big yellow tang and 8 small to mid size fishes in a 3 feet lps tank. Sent from Singapore Reef Club mobile app