We've got a single Bumblebee Platy with a sunken belly and is generally looking sickly. I need help figuring out the problem, pictures below. Here's the tank details:
Tank Size: 56 gallons
Hardness: 150+ ppm
KH/Buffer: ~40 ppm (need to add more crushed coral)
Water Temperature: 75 degrees
The little fellow seems to be eating and the rest of tank is fat and happy. We're feeding a combo of Xtreme Krill flakes and Nano bites, Hikari frozen Brine, and Tubiflex worms. It's a well stocked tank with Salt and Pepper, Green Lantern, and Blue Wag Platys, as well as Serpae Tetras, and a few mutt guppies. The thin fish did get nipped a while ago, before we got the Tetra aggression under control. There's many plants in there including swords, water sprite, and Japan.
What do people think? Worms? I am moving him to our Quarantank so he can get some solo attention.