Years ago an old Chinese guy at a lfs use to sell Siamese Tigers (Dats). He would hold small dats between his pointer finger and thumb and gently squeeze them.. l asked why he was “playing “ with them liked that and he told me it makes them not scary.. he had a small bowl with 3 or 4 dats in it and just get one and hold it near it’s head and lightly squeeze, then he get another.. I wanted to buy 2 and he told me to wait a few days so they could settle down. I went two days later and they had good color, bought two and grew them to 8in and they never turned dark.. I was looking at a post from Monster Aquarium and they had some large dats in bowls and were handling them one after the other. I wonder if there’s something to this. I got seven and all had great color when I put them in my tank.. only 3 have good color all the time. If I get the net then they all light up