If you reduced the intensity it should help the lessen or even stop the algaes growth and it just depends on what the plants would do depending on what types you have. But since you dont have co2 or dose ferts I think they might be more hardy species and you should be fine.
Some snails may get sucked into the filter but they and would probably be fine i there until you cleaned it and took them out. I personally think that snail or other supposed algae eating animals is a poor way to control algae as I have still yet to find an actual animal that eats any significant amount of algae to do any real good,
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