I have 4 different types of plecos ( in 2 different tanks ) and one that I got a few weeks ago is a varient of a zebra pleco (brown) that is about 3 inches long and really beautiful. However I never really get to see any more than its tail poking out from the cave it resides in! (It shifts slightly from time to time). I hardly even see the point of this pleco when I never get to see it! I did read that this is an especially shy species. Presumably it is feeding at night but I don't like to leave food in the tank for long lengths of time incase it contaminates the water so I am not sure what is the right way to make sure the pleco will be fed sufficiently. When I have left some pleco pellets in the tank overnight there is still a lot left in the morning, which urgently needs removing.