According to http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0041296 on "Fish Tank Granuloma Caused by Mycobacterium marinum"
"Many factors play important roles in causing M. marinum infections. These include prescription of local or systemic steroids or immunosuppressive agents, and structural lung diseases. Among these, the primary risk factor is exposure to aquatic environments or marine animals. Thus, M. marinum infection is also known as fish tank granuloma"
Thus, wearing rubber gloves or any at all unless working with specific(dangerous) fish is not something most aquarists should be concerned of.
"Many factors play important roles in causing M. marinum infections. These include prescription of local or systemic steroids or immunosuppressive agents, and structural lung diseases. Among these, the primary risk factor is exposure to aquatic environments or marine animals. Thus, M. marinum infection is also known as fish tank granuloma"
Thus, wearing rubber gloves or any at all unless working with specific(dangerous) fish is not something most aquarists should be concerned of.