Your filtration will likely be fine on each tank. If that is a EBJD, he/she is really washed out right now, also the body shape is strange.
Makes me wonder if he's a product of major inbreeding...
Don't add anymore food to the water, he'll let you know when he's hungry. Remember how fish act? If he's hungry, he'll swim toward the top or even wiggle around while staring at you for food when you walk by.