Hello got some used rock from some guy bought his tank and he gave me the rock already bleached it afew days and it’s still got some dried up snails on it and some other stuff I just wasn’t sure if it’s safe I’ll try and get most off but will it be a concern if I use it? Or should I use my old rock from the old tank which is just an ugly aqua scape design/buy a new rock set that’s new? Here are some photos of the rock after bleach!