Well after almost two years I finally had a leak in one of my boxes. The plants got heavy and spread the seams too much. One of the things I like about my design is that I can eliminate one section at a time from the water flow without stopping the whole system. This is also why it is handy to have an extra section in place so that when I take one section off line the conditions aren’t too harsh on my water test organisms in the last section.
So I bypassed the leaking section bailed it out — just into the next section over and patched it. Hardest part was finding a home for the plants that I didn’t want to compost :-)