bumblebee catfish changing colors?

[MaiMero]

this is what my bumble bee catfish used to look like however i noticed shes turning an almost pink color recently? does anyone know why?

 

[Autumnsky]

What are the parameters of the tank?

Temperature?

pH?

What are your water changes like?

Is the fish getting meaty foods?

 

[MaiMero]

What are the parameters of the tank?

Temperature?

pH?

What are your water changes like?

Is the fish getting meaty foods?

temperature between 70-75
pH im unsure i just did a water change 5 mins ago
my water changes consist of suckimg up the rocks amd then putting cold water back in
i feed them regular fish pellots