Anyone have an idea as to why my little sen has hard yellow fins? They're more like paddles than fins, rigid not bendy. They've been like this since I got him, but he's not growing a lot and looks a lot different than my old sen. I've had him since november and he's grown maybe 1/2 an inch if that in the time? His body and back tail have deformities on them and his head is all lumpy and not smooth like my other one. Not sure if there's anything I can do to help it or if it's just deformed and has uber slow/non existent growth rate as such.