Man that sucks, good luck getting it out of there unharmed...
I ran into this with a buddy of mine a few years back. guy had a 2 year old Jack Dempsey in a 3 gallon eclipse. We rescued him he now lives in my buddies 120 with 2 big ol clown knifes, not to mention the meanest pleco you ever met, lol.
like everyone said, yeah its inhumane and all, but its not permernent right? i mean if its just for an advert, being in a small tank for a few minutes wouldnt really hurt. its like how it is when transporting fishes.
has to be just for the photo if u think about it for the fish to grow that size it would of died way be4 it got to that size, and they probaly put them back straight after anyways