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Maybe add a uv onto the drain line that feeds back to your sump from the qt. This might help disease from coming back to the DT.
Silver Surfer;808688 wrote: Thought of that but it needs to have a flow rate that I can't produce with just overflow.
stacy22;808921 wrote: I firmly believe that you are going to continue having ick in your system. Some fish may be more prone to outbreak than others but the risk will still be there. I do not understand the need to QT fish if the QT and display are plumbed together. This will not eliminate the Cryptocaryon</em>. The UV will not eradicate it either unless you can be sure that 100% of your water has passed through it. This is virtually impossible.
Why bother separating your new fish?
Silver Surfer;808811 wrote: but here is a question: say you have a large tank 300gallons or so and have over 30 fish in that tank. one of the fish gets ich and dies, but none of the other fish show any signs, would you remove all 29 fish or wait 1-2 months before adding another fish?