Yeah water bridges are under-rated. I bend single PVC pipe (fill with sand, tape ends, heat and then gently bend around something with appropriate diameter). Before I started drilling my tanks, I ran a powerhead from the first tank to the last tank to make a slow flowing loop which allows me to economise on heating and filtration. With double 25mm pipes I was able to have 20 tanks in a row before the water level difference became too great. (Double pipes cos fish do get inside and they can block). I had 4 tier tank racks so a single powerhead was able to filter 80 tanks!!
But here is a man who trusts his work...look under the tank!!!