cyano leftovers..

[bv_reefer]

hi i dosed some redslime remover by bluevet, and it worked amazingly and killed all the cyano all over the sand, however it's been gone for about 2 weeks so far but it left this red color on the surface of the sand, the flow mixes the sand but it reappears the next day, it's not nearly as bad as cyano but it still looks kinda ugly...any ideas? it's kinda of a green tint in some spots and green tint in other spots, and it's only covering random patches of sand not the whole surface by any means..still ugly tho