t is really important that corals receive a balanced ratio of calcium and all vital trace elements. Tri Complex was developed according to the latest research and helps offer optimal stable conditions for healthy and steady coral growth. Tri Complex 3 x 5ltr: No mixing necessary. Easy dosage. Highly concentrated 300% solution. Calcium supply without ion shift. Helps reduce water changes. Including all vital trace elements. Optimum coral growth. Highly efficient. Ready to use pH-fix. Content: 5 litres component blue: pH buffer 1+ iodine and fluorine complex. 5 litres component white: pH-buffer 2. 5 litres component red: calcium, magnesium, strontium + vital elements. 5ltr pack will dose a 500ltr aquarium for approximately 100 days (depending on coral type and load).