I need a nitrogen addition to this system as an adjustment.  The algae eater has outgrown the tank and I'm intent on switching from the 29 gallon( 110 l) tank's current occupants into the much, much cooler looking television cabinet tank, and adding the retrofitted aerogarden to that tank.  I think this is a better design approach, and I'm certain that the 20 gallon tank (76 l) could support and…