Yep I agree looks like a featherfin syno to me :) beutiful fish you have and those are my fave syno's too ! They are also sometimes called squeaker catfish...I guess because they may squeak
Little bit of info if your interested from a website I like to use :
The Feather Fin Catfish is a fish for long time aquarists. It is a fun fish to have, but difficult to care for. It gets its name from the wonderful dorsal fin, which rays out, much like a fan. While not always true, the Feather Fin Catfish can require a lot of work to maintain. Feather Fin Catfish, also known as Cat Synodontis Eupterus, Featherfin Synodontis, and Featherfin Squeaker, in general, will not like to share a tank with other fish. They have been known to be very territorial, especially when breeding. There are fish that they might be able to coexist with, however. These include large African Cichlids, as they are equally aggressive. Also, they will sometimes get along with other catfish. Feather Fin Catfish get large, so keep them in large tanks. Also, they like lots of rocks and caves to hide in, as well as moderate plant decoration. Feather Fin Catfish like live plants, and will not bother them. At maturity, the Feather Fin Catfish will grow to a size from five to eight inches. Also, these fish have long life spans. There have been reports of these fish living for 18 years. Young Feather Fin Catfish will have a brown marble with black stripes pattern, while adults will develop into a dull gray color with brown spots. As mentioned before, the Feather Fin Catfish has a beautiful dorsal fin, which rays out, much like a fan.