Don't use window light to "light" your tank. You'll need more light to grow the plants we grow in aquariums/ripariums.
If the tank isn't tempered on the bottom, a canister filter through a drilled bottom is the best thing for ripariums.
Depending how high you put the water it is relatively easy to run a canister over the back. With a little diy it is easy to do on even low level tanks.
Otherwise, an in tank filter will do the job. Can be sort of hidden under and behind the planters.