A 177 is not going to b big enough...It should b ok for like 6-8 months tho....How big is the 1 ur getting?
They eat pretty much anything...Pellets, krill, worms, fish fillets...I feed mine froz krill, tilapia, and bloodworms. They are very greedy eaters...They usually like to eat only when the lights are out..Especially when they r little...I have trained mine to eat with the lights on tho..It's not hard to do, as long as u have some aggressive eating tankmates...I don't find mine to be really aggressive yet..He's about 8" right now and does not bother any other tankmates...However they will eat any fish that can fit into their mouths so b careful when choosing tankmates.
Good luck with it.