What size fish tank are you running that you need an air pump?
Or are you just trying to create positive air pressure to keep the rona virus from
settling in the runner?
In seriousness, the compressor I’m assuming you meant is going to run hot and shouldn’t be hard mounted inside the vehicle in my opinion. I would recommend doing an engine bay mount like most. Otherwise run a portable. I have the larger portable smittybuilt that has been bulletprooof and fills up 33s in a few minutes each.