I have this 6 inch Sen with a couple 8 inch Endli's.
The Sen doesn't stop eating, he get to the food before the Endli's. He's having difficulty swiming he's so fat, is it just over eating or something else.
I'm considering takeing him out at feeding time to see if he thins out.
your senegal seems to be eating alot... Had the same with my spare ornate. she eats a lot and is about 15-16 inches. I was concern of it, but I tried to not put food for a few days and belly went back to normal. she likes diced pork heart. she doesn't have an issue swimming and actively cruising the community tank. here's some pics.