True, polota are the easiest to get onto processed foods, but after a certain while, they get to a point, where the struggle is to watch their weight.I have never kept any of my silvers in brackish conditions but I also wound up trading or selling them after a period of time.Mine have all been the quickest of my dats to train onto pellets and they were very active most of the time.
Here's a link from my past experience
Datinoides polota bloat
One of the datinoides polota I keep has severe bloat, it's eyes have turned cloudy and are bulging, and the fish is pretty badly bloated up. What can be done here, he wouldn't eat any peas.
www.monsterfishkeepers.com