Hm, well this is good to know since I just returned a varios-8 that I spent 400+ on. I have a lifeguard 90w uv (233g tank), what flow would you recommend through that UV?They can multiply quickly asexually. Ostreopsis can really get going quick as they are the most poisonous easily creating enough food to support rapid cell division.
Folks often say "I already have a UV running in-line and it is not working!" That is because the return pump runs them through so fast they are unaffected by it. Algae and bacteria have no armor (theca). Dinos do.
Unless you have a ridiculously oversized UV, you have to run slow.