hey guys im new to the forum ill tell you about my setup and then whats going on i reeeeally need some advice on what to do

so i have a 60gallon hex front long aquarium a mix of sand and gravel and also some aquafloral as my substrate 2 large pieces of bog wood a few rocks ( the kind from pet smart) 2 air stones a marine land bio wheel filter 2 air stones some african sword plants ( the lfs sold hem to me as java moss but i know better ) and a marimo ball as far as other tank mates i have 2 gold gouramis 2 silver dollars ( soon to be in another tank) a bristle nose pleco and a brow knife fish and of course carl my afc! the water parameters and are amonia 0ppm ph 6.7 nitrites 0ppm nirates around 30 ppm temp is between 78 and 80f


so heres the problem i hand feed carl the afc because his tank mates steal his blood worms or brine shrimp i mix up the diet in the tank and the past 2 days carl hasnt been eating as much i have also noiced he is losing some of his color ( he is a dyed albino ) i dont mind it so much but i wanted to kno if that is normal he has lost the color in his legs mostly he also today hid under the morimo ball ( not normal) and when i went to go look for him he ket swiming on top of the water and letting me hold him in my hand ..

there are no signs of bloating or and abnormal redness no weird spots or anything he is just acting strange im thinking he might be shedding and there for is freaking out we have had him in this setup since xmas i do normal 25% water changes the other night i had to add alittle water to the tank because the filter was making some noise i always use stress zyme + to de-chlorinate the water along with a little discus buffer to keep the ph low .... so yes whats up with my frog please any help would be awesome !