Thanks for the input Agg and Brocolli. Yes the Guppies are gutses they gobble up everything you put in. I'm used to just feeding enough for 2 Phantom Tetras so it's a bit tricky for me to judge the correct amount of food to give. I think I may have been overfeeding the guppies so will cut back a bit. I notice they pick around on the bottom a bit too and nibble on the little trailing "vines" (not sure what the correct term is) that come out of my Java Fern.