Make sure that one side of the back wall, where the filtration draws in water to where the blue sponges are, is not going to annihilate it if you do get one. Lettuce nudis eat algae, and most nudis usually dont do well in our systems, but its worth a shot.
Ive found in my 24 gal Aquapod that Ive never had too much algae, except for maybe on the glass. Brownish/green algae that my magfloat takes care of, but the snails have plenty to be alive and kicking.