I used it and had great experience then stopped paying close enough attention to it and the GH shot up to 8 (Was kept at 5, I wasn't topping off with straight RO properly, I wasn't topping off at all just doing water changes). I started losing CRS one by one, babies were dropping like flies. By the time I got the GH back in check they still weren't well. I moved them over to the FSS tank and they were fine. I've got them on Aquasoil now. I don't think there was an issue with the susbtrate on my end, I screwed up. I just couldn't get it back in check. It still had gorgeous shape though after 8 months and was still holding pH steady at 6.5