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Thanks for your answer , can I ask what you have for pest deterrent/workers/CUC in your tank?I honestly think introducing predators to deal with pests in a tank is an extreme solution which should not be done in most cases.
Most such predators basically come in two groups.
On one hand, there's the dedicated predators of a single thing, like harlequin shrimps and the nudibranchs that eat aiptasia or red planaria. They can put a dent in the pest population, but eventually need to be rehomed lest they starve to death, and sometimes don't get every one. Harlequin shrimp have a good reputation for being able to "get every one" but this is less true with the nudis.
On the other hand, things like sixlines, arrow crabs, bumblebee snails, and the like are really generalist predators of things that crawl on your rocks and sand. They will generally not bother your coral, but they will decimate lots of other small lifeforms besides your intended target. The result is your tank ecosystem will be kinda denuded of life in certain ecological niches, which opens your tank up to being colonized by the pest organisms they don't munch on.