its totaly obvious from the first picture that the fish is fading. This is normal and nothing to worry about at all. The second picture look allmost like the small female is getting ready to lay eggs to me. When females get ready to lay, they turn very dark like that. Has NOTHING to do with stress at all. People are confusing "stress bars" with the black from the fading process, and female turning dark because she's "in the mood". Also white poo does not mean internal parasites bro. it could be sign of hex, but they poo white sometimes. If the fish is eating, it's more than likely not hex. Too many people make general assumptions from bad information they have heard. Just like a black spot on dorsal means its a female. I would suggest looking on some dedicated flowerhorn forums for information bro, you will learn a lot more IMO.