Hahaha, 1100gph is more than enough responsiveness on a 90 gallon!

Yes, in that case, no comparison..........no way to mix that much gas into water without something like the the venturi.........

I have a lot of flow in my tanks, so I know that this lack of flow is a non issue.
I also want to throttle the flows back some, so this gives a nice trade off.

I use slow flows on the over flow system and high flows on the closed loop canister.
I use two systems on most tanks so I can do a number of things and balance each's trade off.

Good point of clarification mrkookm.

Going back to the idea of trade offs and two independent systems, my client's tank has both, and we/you/myself can also do the same here.

Have a pair of disc or a single in the tank and venturi and then you can see on the same the tank.

But as mentioned, sizing the venturi and pump to match is a good idea and critical. I sort of eluded to that in a round about way


Regards,
Tom Barr