I have 5 Sterbai Corys in a tank with 10 Dwarf Rainbowfish and 12 Black Neon Tetras. The corys are really active and seem pretty happy but they just don't seem interested in food.... I have some New Era catfish pellets and also some Hikari sinking wafers but they just seem to ignore them. The dwarf rainbowfish actually grab a load of the catfish pellets on the way down but even when I have distracted the rainbows with food and dropped pellets / wafers almost on top of the corys they don't stop swimming. The dwarf rainbows then generally locate the pellets and gobble them up. I even tried putting the wafers inside a cave where the corys seem to go through but the wafers were still there untouched 24 hours later. An indeed in one of the bigger caves, the greedy dwarf rainbows just went in there and hoovered them up. Given they are still looking pretty healthy and swimming around like mad I presume they are eating but not sure what... Should I be concerned or are the OK to fend for themselves and will barge the rainbows out the way if they are hungry?