I had a chalk and added a dottyback yrs ago. It didn't work out. Even though i had the chalk first, the dottyback took over his territory and forced the chalk to stay in hiding most of the time. So no, I wouldn't do it, found out myself doyybacks and bassletts don't get along. Either does bassletts and baseletts or dottybacks and dottybacks. Perhaps in a larger tank, mine was a 75.