The gourami probably was picking at them that much. I dont mix shrimp and gouramis because my gouramis usually make snacks of them. The wood shrimp are larger but still sensitive to aggression. Wood shrimp usually stir up the bottom and are a filter feeder I do believe so they eat smaller organisms so you may want to add some java moss or another of the moss's as they provide a good location for food to develop for wood shrimp.
So to sum it up, the gourami was probably part of the problem, the filter was probably making it easy for them to eat so they probably placed themselves near the filter return.
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