Very very nice!
How about putting some cheato in the first section with the heaters? That drain seems like it would tumble cheato really well.
LOL, just noticed your light on the cheato... the "legs" look just like mine, all bent trying to get them to move after they rusted in place.
This may be a silly question, but what is chaeto?
Awesome set up by the way. I love all of the space you have. Do you have water temperature issues with part of the system being in the garage? I guess you probably have heat, etc in the garage. I live in Texas and my garage is 90 degrees in August and 25 degrees in January.