My experience feed training RES is that once feed hits the bottom most of it will go uneaten. A very slow sinking feed would be better, movement seems to be a feeding trigger and once it hits the bottom and is no longer moving it normally doesn't get eaten. Last time I feed trained RES I had 4 or 5 RES that would pick pellets off the bottom of the tank, the other 80 of so RES just ignored the motionless feed on the bottom.
| 
