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In 1991 Klostermann published an article in FAMA on "Phosphorus in the Marine Aquarium" where he recommended Strontium addition to eliminate phosphorus. Has anyone used this? I have used lanthanum Chloride and had problems with large tangs going belly up. They revived when placed into a tank with no Lanthanum. It seemed like a threshold was reached where phosphates were lowered and then suddenly the lanthanum became toxic. I am working with a 3000 gallon system and working on cyano removal and phosphorus reduction. Currently Ca++ = 390-420, temp = 77.7, Alk= 2.95-3.01, Po4= 0.08-0.14, ORP= 392-408. We change 400 gallons/ week and are increasing to 1000 gallons/week of fresh salt mix, Instant Ocean. We use some Iron removal and some Kalkwasser. Feed is primarily Zeigler pellets. Mix of corals and fish. Any suggestions for improvement. I am looking at building a anerobic bacterial column to reduce phosphate. Any articles on designs, calculations etc ? Thanks for the help.