Ancistrus Lineolatus, or Bristlenose Pleco, is sort of a freakish looking fish.  They come from the Upper Amazon, in Colombia.  Usually, this fish is not visible when the lights are on.  This fish makes its appearance just after lights off.  A well behaved Bristlenose, that is, one that does not eat holes in plants, is a major asset to the planted tank keeper.  The Bristlenose keeps algae off the tank walls, drift wood and other ornaments within the tank.  To keep a Bristlenose away from tank plants, these fish require a feeding at least three or four times a week consisting of a frozen slice of cucumber (pre-freezing makes the cucumber more tender) or a couple of store bought algae wafers.  One must keep watch on these fish as they grow larger, for they are quite capable of wreaking havoc on plants, particularly broadleaf Amazon Swords.  Keeping them well fed helps stave off the negative plant eating behavior.  Fully grown, a Bristlenose can reach 6 inches in length--- much smaller than some other kinds of Plecos.  The larger they get, the more their mouths tend to damage plants, so beware.  Tank temperature should be between 72 and 80 degrees Fahrenheit. Interestingly, the "wiskers" on this fish are actually sensitive tactile and olfactory accessory organs that allow this beast to feel his way around in darkness and smell whatever food particles there are to be found on the bottom.