I don't think so Jack. It would affect a 20g tank the same as a 200g sumpless tank. Now being sumpless it may affect your tank more if you do not have good gas exchange.
The ammount of flow going through the reactor is all relative to the tank size.
I don't think you will have a problem as long as you have good flow in the tank.
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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