Sorry I guess I skimmed through your post too quickly.
What kind of algae are you having a bloom of? There are so many different types and each has its own predators.
Tuxedo urchins are a popular choice and work well for me to control hair algaes. Aside from carrying small items around your tank they typically dont cause any problems. Just like snails they can be introduced if your tank has cycled and has clean stable water parameters.
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