That's a good looking del! I find that salmon filets are a bit too oiled and tend to murk up my water but definitely try feeding tilapia and sole. Silver sides are good too because there is nutrition in the bones and skin of the fish that bichirs get in the wild but lose when they are fed pellets and fillets.
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Just fat and happy. Good looking also
.Del's are known to get fat, but try feeding it catfish or some other oily fish once in a while to aid with digestion.