What bottom paints are compatible with aluminum boats?

Do not use a copper-based antifouling paint on an aluminum boat because a galvanic reaction will pit and erode the aluminum.

There are many copper-free paints that feature alternative biocides safe for aluminum, here are a few:

Interlux Trilux

Interlux Pacifica Plus

Pettit Hydrocoat Eco

TotalBoat AlumiPaint AF

Totalboat Krypton

Interlux Micron CF

Pettit Ultima ECO

Pettit ECO HRT

Sea Hawk Smart Solution