Last weekend, I spent two days moving livestock and rock from the 215g into the 400g and the 60g tanks, both which were ready and waiting. As I'd discussed previously, my original plan was to tie all three tanks together into the common sump so the water would be shared and all parameters would match. The 60g was plumbed into the sump already, but the 400g was running independently, not quite full enough to drain. It had over 300g of saltwater in it, along with sand and rock and ...