No I don't have the goonch anymore. I had it from 1997 to 2009. Mine never got very big and only was around 36" when it died. My other fish mutilated the body and I was unable to retrieve it.
I had mine in the 52,000 gallon. The temps there get as low as 68F.  but are on average 72 to 78F. I actually never fed him feeders except when he was young but did keep a shoal of small fish in with him while he learned to eat chunks of Mackerel, herring, lake trout, smelts etc. Once he was big enough he went into the big tank and always had large numbers of cichlids to eat between my feedings of fish/pellets etc to the tank. 
Have you started the build on the big tank yet?