Mebbe you guys might want to try having a set-up like this one below mentioned in this site.
http://www.loaches.com/river_tank.shtml
Why I would think so?? Coz plecs come from fast water streams and rivers that force them to modify their head into the suckermouths. This allowed them to stay at one position while still being able to feed at the same time. Do think about it and mebbe the fishes will be more easily observed this way instead of allowing them to be left in still waters and letting them hide almost all the time
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