I need an auto-topoff for a 30 gallon sumpless tank.
I have an osmolator on my other tank and it works well.
I don't know if the osmolator or the JBJ would be better on a sumpless tank.
On the osmolator there is a backup safety float switch to turn the unit off if it fills too high, I don't know if this can be set low enough to work on a tank without a sump.
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