Datanoid issue?

Shaunieboy88

Feeder Fish
Feb 26, 2017
1
0
6
33
U.K.
Hello I'm after some help with one of my dats brought two of them at the same time very small to grow on for my predator tank. One is eating everything i feed to him the other one doesn't seem interested in any food and has something strange on its sides any ideas on what could be wrong with him. Here's a couple pictures any help would be appreciated thanks

IMG_0855.JPG

IMG_0854.JPG
 
zoomed.com
hikariusa.com
aqaimports.com
Store