I mixed up around 180G of sea water and started to fill my tank and sump. Once I had the whole system filled and running I noticed that there was water next to my sump. The next morning a noticed a little more water and I started to worry. Luckily when I had my tank built I had them put an acrylic liner along the entire length of the tank. That way if there is a leak in the system it will save the floor. The liner has a 5 inch edge around it creating a bowl. This has saved my many times over ...