Mine did the same. Remove them from the light. I put them in the shade and started to feed more. They have too much light.
Mine are now pretty much back to normal color, but I still keep them in the shade and away from the light.
You need to put them in a low flow area or cut the pump to feed them. frozen cyclop is an excellent food. You put the cyclop on them or frozen brine, and wait a bit. They eat like pigs and they need food to survive because they don,t like light, they like food 3 times per weeks min.
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