Tilapia are indeed pellet hogs, BUT, you get far more bang for your feed-buck when they eat pellets. Feeding is generally done to produce bigger bluegill, faster, as bass forage...Tilapia convert feed at 1.2:1 and BG at 4:1 and get eaten instead of the BG.

Tilapia eating pellets won't make a noticable change in algae control since tilapia eat constantly...as soon as the feed is swallowed, they are back to work browsing on algae.