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i was watching my clown loaches moving a piece of gravel back and foruth.

One picked it up, and moved it over, and the other would move it back where it was.... they were doing that for at least 3 hours

in the hunt for more blood worms that have lived in my tank for years, my clowns are doing two things nowdays. the first is burying their heads in the gravel, they dig a hole with their head, and by picking up stones wit their teeth or tooth. and pile them up next to the hole. they then stick their head under the gravel and push more rocks on top with their tale. the second thing they have taken to doing is pulling my amazon sword rots out one by one. they work their heads behind the root then work it out and leave it floating, still attached though, they have even moved large pebbles to get to the roots