Well you can plumb the frag tank seperately, with it's own ball valves, in and out. When you want to quarantine, just place all your frags into the main system, close all ball valves, place a heater and powerhead in your frag tank and you're good to go for a quarantine. Just make sure that when you do plumb the drain for the frag tank, you make it possible to drain the entire frag tank elsewhere other than your sump (just in case you have a disease that you don't want spreading to your main system).
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