Hey frands As I have a few more large tanks going up, I'm thinking about what can make my fish room more effective and easier to maintain. I have a commercial air pump I was planning on hooking up but have sumps in the back of my mind. Here's the real question: can I use one sump for more than one tank without drilling anything? Or is that just stupid (speak freely). Like could I run a closed loop system from sump to tank to tank to tank to sump? I'm going to have an overstocked 110, a moderately stocked 125, and two very understocked planted 125 and 90. I guess sponges sound much easier. I just figured if I could take advantage of balancing the understocked and overstocked then I could have increased water volume, take advantage of the plants as nitrate reducers since I can't have plants in some of the tanks, and have one single point of entry for water changes rather than doing each tank. Thoughts? Obv QT is absolutely necessary in this scenario and risks run higher.