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how many hydors for my 135?

right now i have 4 mj with the mod kit 2 alternate and 2 are constant and i hate them. They constantly suck air no matter how low i put them or adjust the fan shroud. I want to switch to some korilia 4's. Currently i have a sand bed but will be removing some of it during each water change i do. I am going to have an sps dominated tank so how many should i get?
 
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