I mod'd the tank, and added a second return with a dual output, and then put a Hydor on the original return. I have a chiller that I had a MJ900 origianally, but went to a MJ1200 for better circulation. I then moved my chiller closer, because the MJ1200 was actually making my tank hotter! So I put the MJ900 back in for the chiller. I also added a Remora Nano Skimmer with a third MJ900. I am also thinking about adding a hand on on the back for additional filtration, just not sure what I want to do yet.