06-08-2011, 02:08 PM
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You can't change a fish's temperament. However, some steps can be taken to perhaps reduce the stress on the substrate fish. First, I would feed some sinking foods at night. Loaches are not nocturnal, but pleco are, so the pleco will get food. Second, feed a lot of sinking food, hopefully the gourami will concentrate on one bit and the loaches will get other. Third, if this is only once or twice and not daily, it may not be an issue.
I have fish (cichlids like Bolivian Ram, Apistogramma, etc) that do this from time to time with the corys. As long as physical damage is not occurring, and it is not continuous, it may not cause much stress. Only you can judge that, as you are there to observe long-term. If this does get worse, obviously removing the offender or the others is the only viable option.