Yes, there is added benefits of more water volume... my first and most wanted reason is for salinity changes with evaporation..1G evap from 50G is much more of an impact than 1G from 100G
When you get this set-up you will see a nice drop in nitrates and of nuisance algea in the main tank! I have also found that you don't need to do near as many water changes.... but the downside is more testing to make sure your calcium doesn't drop too much...among other things...
Good luck LORNA and can't wait to see pics!!
Might I also suggest the macro Lettuce Leaf... It has worked awesome for me since I built my current sump/fuge