I think what I use my hospital tanks for is different than other people. If I notice a fish is hiding to much or doesnt seem to be eating I will remove them from the DT and put them in the hospital. No visable disease and nothing to medicate just seperate them so they dont stress out and can eat and stay healthy before a problem starts. My new fish will spend over a month in quarantine. After the first few days you know if its sick or not and can allow the same water from the display tank to be shared with the hospital. They are kept that long to make sure you can adjust their feeding types and times from how the LFS
did it to how you do it as well as allow them a good amount of time to get good and healthy not to mention de stressed before I move them in.
The other question was how to keep bad water out of the sump if you do have a sick fish. With the valves on the intake for the 3 tanks I can close off 1 of the 10g. They will be using an overflow system so without water flowing in from the pump it cant overflow and drain into the sump. Additionally I will have pvc
pipe caps that I will place over the overflow so if I have to put my hands in there I wont cause the water level to rise over the overflow and sending sick fish water into my whole system.
Any other improvement ideas or design concerns? Once I hear back aboit this micro sump idea on the 2 10g tanks we may be ready to start sketching out are idea frame as well as plumping and electrical.