Hi Justin – PLEASE forgive my inability just now – to send you a more direct answer.  After doing much research on aquaponics I realize that it uses MUCH LESS WATER than other systems of gardening or farming.  Countries who have desert like conditions use aquaponics with wonderful success – and it is a puzzle to me.  It appears that our water cycle is closely reproduced in the aquaponic setup.  For small windows many people do well with hydroponics and I love seeing their wonderful work.    I loved the fish tank and joined window farmers who were getting into this area.  With my temporary soil setup, I have to water each plant separately.  While the dark soil might generate more heat causing evaporation – there seems to be much more at play with the fish tank and completing the water cycle.  BUT, I AM NO scientist – just another fascinated window farmer – watching the wonders of growing in window conditions.  There are disapointments and successes.  Sylvia Woerner Manchester IN USA.