I have a tank with 2 blue neon dwarf gouramis, 2 other dwarfs, 3 glow tetras and a orbi stingray pup. I got the blues about a week ago and one of them is acting weird....as in it seems to love me. I am in the tank daily doing a small water change and it started trying to eat my arm. Now when I put my hand in there he swims over and rubs all over in my hand and on my fingers. He even lets me touch him first. And if I just dangle my hand there he continues to swim between my fingers and rub in my hand. He is eating fine....he has a huge appetite for such a little guy. Is this normal for this kind of fish? Iv had Oscars that don't mind being touched, but nothing like this.