05-08-2011, 11:05 PM
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Why bother with the auto top-off? Your going to end up topping off that top tank anyway, might as well skip it.
Your concept seems fine, but it would depend on what you are breeding since different fish need different environments. Your setup seems like it would work well in general (as meaning for most of the commonly traded fish) but if your were, lets say, breeding bettas, this would not work at all.
Also, have you thought of how the pump will return the water? are you going to be using 4 separate pumps? Water will go the path with least resistance so if you were thinking 1 pump, most of the water will not reach the 3rd level, running multiple pumps will cost you more.
Also running your quarantine on the same system seems counter productive since if the fish there are sick all your tanks are gonna get infected anyway since they all get mixed in the sump.