Greetings, all!  My wife and I have finally started building our garage aquaponics system!  :D  We're planning on using two 55 gallon drums, one as our fishtank and the other as our growbeds.  Our ideal location for this project is our attached two-car garage; the layout of our yard and existing landscaping makes it difficult to put up a tasteful looking greenhouse outside.  I realize that our id…