dimanche 25 mai 2014

Please help

Please need some advise



Hello all and thanks for any help in advance.I have just setup my 200l marine saltwater tank again after a year. The old rock and sand has been sat in tank with saltwater for this periodMay be a bit long but will list what i have done and where im at.I cleaned all old rock and sand with ro water properlyI then put rock and sand backI made up the water and added to tank.*So i then obv needed to start the cycle process so i boughtfrom the fish shop a new piece of cured rock and say a cup full off sand to start the process.Day one of cycle all ok ammonia up 0.50ppm nirite 0 nirates 15ppmCalcuim 480ppm ph 7.6 and Ch 10dkhBUT day 2 today i have come to my tank after beeing out for the day and one of the old live rock is BLACK i have checked it and i CAN scrap off the black. My reading are ammonia 0.32 nirite 0 and nirates 7ppmI just want some advise on the black rock hope have provided enough info and thanks for any advise in advance




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