Recently, I have lost a couple black spotted corys in my 75 gallon tank with perfect water conditions. They show no signs of disease or injury so I started thinking, since corys are scavengers and bottom feeders, how do you know they are getting enough to eat? My tetras, angels and SAEs all eat the sinking pellets I drop in too so they aren't going strictly to the corys. I sometimes wonder if they are getting anything at all to eat. Both of my tanks are heavily planted so any flake food that eventually sinks from the top probably ends up on plants so it doesn't get to the bottom for them to eat. Obviously, I don't want to over feed but I don't want to starve them to death either.