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I read a post by RanchuDressing who recommended aragonite sand as crushed coral substitute for its better and larger life span when used as natural ph buffer. I'm curently using Alkaline Buffer by Seachem that does the job but when I run out if it would like to switch to somthing else as I'm not a big fan of pouring chemicals in my tanks. So I looked up aragonite sand and found out that it is indeed an excellent and long lasting buffer and natrates and ammonia remover due to de life bacteria it caries. However, in the information provided it was also stated that the bacteria "fall asleep" and don't do their job at low temperatures. The text didn't say what is meant by low temperatures but considering it's normal usage is in tropical/reef aquariums I recon the temparatures at which goldfish are normaly kept should fall into this category. With that info in mind I can't help but ask myself, is aragonite at all sutable for goldfish tanks? Do you guys use it? And one more thing. Have any of you used it in a HOB filter?