How to uncompress multiple Zlib Archives with one comand

I have >200 .zlib Archives and I want to uncompress them using one command in Linux console. I just cant get the command right. maybe somone can help me: for z in *.zlib; do; zlib-flate -uncompress $z ; done When I run this command every file is empty. I don't really care about the output-filename, so this could be just a counter or a added string for example. Many thanks!