I recently bout 40 tanks from a pet store that closed down . I need some ideas on how to set up a filter for them . Thay all have 2 bulkheads in them on the top in the back side. I also have the pump that was used to run them all . I was thinking about setting up a closed loop system. I would like to be able to set it up with the one pump. I'm new to large scale filtration. The biggest I've set up for is a 210g . I'm also kinda doing it on a budget .