Invert algae eater for my tank???

Nerite snails are amazing against algae. I've never seen them go after leftover fish food, but mystery snails will. Both are very interesting and come in a variety of patterns and colors. Nerites dont generally breed in freshwater and mystery snails lay their eggs above the water surface so they are easy to remove if you dont want them breeding.

I second nerites...probably the best option given your stock (dwarf shrimp might get picked off) and overall algae-eating efficiency. Although, keep in mind there are types of algae that the nerites aren't likely to touch or make much of a dent in. But as vwill said, the other nice thing with nerites is that there's about zero chance they'll ever become a population problem.

Adult amano shrimp might be large enough to avoid the rams/gourami, but I can't say that for sure as I've never tried the mix. They would do better at picking up leftover scraps and can do a decent job on some of the hairier algae. They too aren't going to breed in the typical aquarium setting.

Also, just to be that guy, remember that a "clean up crew" isn't a substitution for proper maintenance