I love these fish. Yes, they eat algue but it's best to not rely on only algue for them. The most common cause of death for these guys is starvation. I bought one of these acople years back for a tank that had a ton of algue in it. You could almost not see into it. The algue was on everything and it was in long strings. I got him and a siamese algue eater for clean up duty. Together they cleaned up the tank in acople hours. Beware that if you don't keep a constant supply of food for them they can and will die. That's what happened to mine because I didn't know enough about them at the time. I wish I did because he was a wonderful fish. The siamese algue eater lived for about three months and then one day it just stopped eating and a week or two later it died also. I haven't able to find the whiptail since the day I got mine. If I came across it again I'd get him in a second. I mine whiptail never sucked on other fish, this doesn't mean your won't. Here's some information about from a book I have.
Description A very long, slender sucker-mouth catfish,
twig-like in appearance. A very long snoutsticks way out in
front of the mouth. The body color is light brown with a dark
brown stripe running along the sides. Maximum size nearly 5 in.
Distribution Amazion.
Temperament & Care A shy, retiring species which
should be kept with quiet fish in a tank that has an abundant
growth of algae. Most specimens will starve to death in
captivity without such an adequate supply.
Breeding Pairs spawn on vertical surfaces. The male
guards the eggs from harm. When they are ready to hatch, he
helps break them out of the egg shells. Aqurium Fish
Identifier Derek J. Lambert, 1997 Quintent Publishing
Limited.
Their tempature range is from 73f to 82f. The scientific name is Farlowella Acus I think I did my parenthetical citation wrong. Oh well.