Somehow I missed out on the fact that guppies will munch on tank algae. My last guppies were from childhood, but I added two male guppies to my tank 2 days ago. Tonight I noticed that they are doing a great job eating a white/gray algae off of my filter intake and output tubes! They are eating flake and pellet foods just fine, but I guess they wanted more fiber! Do other guppy owners find the same thing?