Can mandarins be dewormed?

[MaxtheCat]

Hello friends! We have three mandarins, two blue and one green, but only one blue is captive bred. All came to us skinny as hell and only one of the blue, the wild caught female, mandarins never fattened up. She is too skinny but eats all the time. We not only put pods that we raise in the tank at least weekly, but I switch out clumps of chaeto from the sump every two days and get monthly subscriptions of pods from Algae Barn. She is still the only one not plump. It's possible that she has internal parasites, right? What do you suggest we do for a mandarin?

 

[reefer024]

Do any of them eat frozen?

 

[DE FISH]

What size tank are they in ? could be its being out competed by the other mandarins.