Do I need an air pump for my 45 gal?

I finsihed cylcing my 45 gal tank last week and added my first fish to
it on Sunday. The (flourite) substrate surface is 66% planted with
cabomba and grass.

I only have a little surface agitation, caused by a Fluval 302 filter-
but would prefer to have none; I'd rather keep the filter output a
couple of inches below the surface.

Can anyone offer advice about an air pump? Do I need it at all? If
not, is it sufficient just to have surface agitation caused by the
filter? I'd really like to do without the noise and bubbles if
possible. I'm not happy with the advice I was given so far, which is
to wait and see if the fish appear to be 'gasping' for oxygen to get
my answer.

Thanks,
Joe