I have been using it for over a year with Corys and all is well. But you MUST stay away from the recycled product as it will have been contaminated with bits for whatever it was used for to blast previously. It comes in a mesh bag from black diamond. Do wash it as it can be messy I think the oily looking surface thing many people complain about is just tiny fragments of the product. Eg dust. Definitely should get that out so it doesn’t wind up in places it shouldn’t. (Pump). Best thing I have found is buy an extra bag or two and sift it with water through a window screen out in the yard and let the dust just go into the grass. Fast clean and is easier I think that filling and dumping a tote a million times. My $0.02
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