Been very busy lately so haven't managed to post any updates on how the fish are doing. Generally, I'd say they are doing very well and I think they love having what must feel like a million times more space from where they used to be.
I've currently sectioned off about 1/3 of the pond which is 22'x15'x3'. Due to recent schedule, have not been able to get the tilapia from another house so I have to admit that they have been fed cheap baby 'Koi' for now. It's advertised as Koi at just about every LFS but obviously aren't from Japan. Cost about 2-3 bucks each and are roughly 3" or so.
Here are some pictures of the pond. This was just before cleaning so please excuse the mess. I know I should have taken pictures AFTER the pond was cleaned but I didn't have a camera with me and was rushed for time. Spent about 45 minutes feeding them by putting in a couple of the baby Koi every few minutes. After a few times, they both figured out that I was the source of food and they'd come to me for a fish, swallow, swim a couple times around and then back for another helping. I got one of my workers to quietly release a couple on the opposite side while they were facing my direction. The smaller of the two took awhile to realize this and by then the bigger one had already sensed it, turned around and swallowed the Koi.
Anyway here are some bad pictures courtesy of my Blackberry. The first picture is from a slope looking down at the pond. The second and third pictures are of the smaller and larger Arapaima respectively. The last one is just to show what the feeders looked like.
Apologies again for bad pictures and sorry for long post.