Hi Jacob

Life needs a lot of high quality energy to get started and to keep going. Earth's biosphere is powered mostly by the Sun. Europa's has been suggested to be based on sulphur-based compounds produced by vulcanism and Enceladus would be analogous. Neither would be very vigorous as the best estimates of volcanic energy available is much, much lower than for Earth. Europa might also have ice-subduction allowing free-radicals in the surface ices to be transported into the fluid below, and Enceladus looks to have undergone similar overturning. This might provide a bit of a boost, but it's less than what Earthly sunshine provides in abundance. IMHO the odds aren't great. Maybe bacterial seeding from Earth has occurred on both, but I don't think the odds are in favour of indigenous life.

Life needs more than liquid water - take near-in Neptune class planets, which are likely to have lost their hydro-helium envelopes and have planetary sized oceans. Problem is that about ~ 100 km down the water becomes Ice VII and progressively gets denser the deeper you go. The only nutrients available will be from either meteorites and/or gigantic volcanic plumes that can melt through the ~ 1000s of kms of ice. Lots of water, sunlight, even organics but perhaps utterly sterile for want of trace elements.

Adam