HI,
I had one that would slide up on the larger fish and try and feed on the slime after they are sleeping . Do you offer any pleco algae disk food at nite. MAny of the pleco are pretty hungry due to the lack of algae and many love to have wood in the tank to chew on. Most wood can taint the water a little yellow but if you have carbon filters they will clear it.
MAny pleco's will not live without wood. there are some awsome dwarf pleco's I like clown pleco, zebra(pricy), I have rhino, and a rare red velvet pleco. I saw an article in a fish magazine about pleco's and they had a picture of one speared in the amazon that was over three feet..
Doug
Clown Pleco
Zebra pleco
Royal Pleco
Rhino PLeco
HI,
here's a bunch of pleco pics,
http://www.ekkwill.com/wildplecos.html