Hi! Right now i have a common pleco and a hi-fin butterfly pleco in a 55 gallon tank with ebjds and dempseys. Right now, i feed them spirulina discs by wardley to them every night. However, i cant tell if they are eating or not! I think that the dempseys are coming in to nibble on the discs before the plecos get to em. How can I tell if they are eating?



