Reducing current while maintaining flow

[magnosis]

I've just added a second canister filter (Eheim ProII 2026) to my 59g planted goldfish tank. These pigs were overloading my Fluval 305 which needed to be at least partially cleaned on a weekly basis.


I think there's too much current in the tank now.  The goldfish aren't very good swimmers; if they try to swim in the upper half of the tank, they'll just stay in place and get pushed back as soon as they rest.

How can I reduce the current, while maintaining a high flow ?  I would like both canisters to function at high rate, but it creates quite a tsunami when I do that 

[Quatro]

do you have both intakes on one side and the outflows on the other?  if so, swap them so there is one of each on each side.  direct the outflow towards the glass to diffuse it a bit.

[dan2x38]

You can use spary bars to instead of spouts.

[magnosis]

My intakes & outputs are like so :




@dan, the Eheim came with spray bars.  They are 3 pieces of 4" pipes with 6 holes in each.  I used only 2, otherwise it would spray directly into the surface skimmer and that wouldn't be good.

Maybe I should drill more holes ....

[dan2x38]

You could add a tee in the return line with a ball valve. From there connect it to the intake of the other one. Might have to use a Wye or check valve I think when connecting to the intake. You will still get same pass through but able to control input flow without damaging filter motor either.