gulper catfish

http://www.aquabid.com/cgi-bin/auction/auction.cgi?fwcatfish&1484932212 sweet gulper catfish on aqua bid. how big do they get? the only thing I know is that they frequently eat fish their size and longer!really cool thought!

Hello everyone I have since Friday a 9cm (3,5-4 inch) Gulper Catfish. He is in a 200l (55 gallon) tank. Now my question is: How many times should i feed him and wich size should the feeder Fish have? Sorry for my bad English, im from Switzerland... Thanks for Responses Chrigu