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· Premium Member
7,439 Posts
You can't link tanks to one canister filter without big risks of spilling a lot of water. A closed loop filtration scheme, which a canister filter is, works only because the same amount of water is siphoned into the tank as is pumped back to the tank. When you add another tank you risk pumping more water to one tank than is siphoned from that tank.

Also, sharing one filter with two or more tanks gives any disease organisms, pests, algae spores, etc. free access to all of the tanks. I have seen LFS setups where the filter serves multiple tanks, but those all involve a serial movement of water from tank to tank to tank to filter, as I recall.
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