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Discussion Starter · #1 ·
So in my 55g tank, I have a Aquaclear 70 for surface agitation and a Eheim 2217 filter w/inline pressurized CO2. I've noticed that the back of my tank doesn't get much flow and there seems to be above average algae growth in that area. I was wondering if there's a better way to place my filters? I also have a Hydor nano 565 laying around but I don't know if i need it/where to place it.

Can anyone look at my setup and throw some recommendations for optimal water movement?

So the eheim intake and the HOB is on the left side of the tank. The eheim outlet is on the right side of the tank and the holes of the outlet are facing straight towards the front glass.
 

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Here is a way to assess water movement.

Get a stick such as a bit of bamboo or a dowel. The dowel should be long enough to reach the bottom of the tank. Longer is just fine.
Tie some thread to it at about 4" intervals, leaving several inches hanging.
Put this in the tank in many places and watch the thread. You can see the direction and get some idea of the force of the flow in different areas.

Try moving the AC70 closer to the middle of the tank.
Try adding the circulation pump in different locations: higher or lower, aimed one way or another...

It may take some time, but when you think the flow is better, let it run for a week or so.
Remove most of the algae by hand, no need to get fanatical about it, and watch to see how fast it recovers.

In general you want to aim the various pumps so they enhance each others' flow. Not cross, not create chaos.

How well are the filters doing at removing debris? Does one need to be cleaned more often than the other? (The dirty one is doing its job- removing debris)
 

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Discussion Starter · #3 ·
I would say both filters are pretty good at taking in debris. Every week there's a good amount of old plant leaves and what not on the inlets. I'm thinking about aiming the eheim outlet more towards the left (and towards the inlets) so i can get a left to right flow. Should i also put in the powerhead and point it to the left?

Also I'll definitely try the stick idea!
 
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