Ditch this idea.
Cheap-o thinking like this, will end up with water on the floor.
Just splitting intake and return will not mean both lines will flow equally.
You will end up with one tank overflowing sooner or later.
Use the 205 on the one tank and whatever on the other.
I must be missing something. How can a canister filter return more water to the top tank than it is removing from the bottom tank? If you put a one way valve or anti siphon hole in the return to the top tank it would not be able to siphon back to the bottom tank when shut off.
The intake are spitted and comes from both tanks. The water enters into the canister filter. The problem is when it exits. We can't be 100% sure that the amount of water taken from Tank 1 would all be returned into Tank 1. Some of it could go to the other output and into Tank 2. Thus, Tank 2 would continue receiving more water than is suck into the filter and PRESTO! Water on floor.
The intake are spitted and comes from both tanks. The water enters into the canister filter. The problem is when it exits. We can't be 100% sure that the amount of water taken from Tank 1 would all be returned into Tank 1. Some of it could go to the other output and into Tank 2. Thus, Tank 2 would continue receiving more water than is suck into the filter and PRESTO! Water on floor.
If water is removed from tank one then returned to tank two and tank two has an overflow to return water to tank one I still do not see how you could end up with more water than a tank can hold in one tank.
