Community Tank question

So I'm still pretty new to the hobby, but I want to make sure I don't over crowd my tank and make sure everyone in there is happy.

I have:

30gal planted tank

A rainbow shark
Flame dwarf gourami
6 harlequin raspboras

I want to add something to help with glass cleaning algae wise. My gf suggested a bristlenose pleco but I'm worried that it might crowd my shark. Any ideas what might be a good option that isn't snails or if the bristlenose would be okay.

Thanks all