[billsreef]

100' is basically still shallow. Not much difference between there and the surface in terms of temperature and salinity. It is deep enough to require the fish undergoes decompression, but nothing else is needed for them adapt to surface conditions such as our tanks. Richard Pyle has brough fish up from much deeper, around 400'. These still can be adapted to life in a tank, but they require a much longer decompression time when collected. Temps tend to be a bit cooler at those depths, that needs to be considered also. I think the OP is looking at things from over 1,000' based on his post, that not brings up temp, but adaptations to great pressure that could be a consideration for getting them to live in a tank.