The smaller flowerhorn in the pictures is in question. The color looks faded and dark, has no kok, but it does not have the dots on the dorsal fin like a female would so I am not 100% sure if it's female. I really don't wanna check the anal pore...
UPDATE: so I took Fish on Fire's advice and move the little guy out to a separate tank since this post and here is how he(?) looks like now after almost two weeks.
that fish is puny for five months. It looks like a 2 month old juvie. Start feeding him twice a day, as much as he can eat in five minutes time. That fish should be at least 4" plus by now.