Add beefhearts to the diet. Trim the fats first. Never fed it to my bichirs but I heard that the bichir's size explodes after being fed beefhearts. only feed them to babys. Not too much though.
+1. Been feeding my grow outs beef heart on Sundays, fish fillets/shrimp/chopped silver sides on Saturdays, and hikari carnivores the rest of the week. From a 3" baby, my del grew to 7.5" in just 3 months. Got pretty fat too. He is a really heavy eater and really active tho he doesnt have markings like yours. Goodluck with your del!
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