Is it the placement of my koralia's or just not enough flow?

[Gregcoyote]

There should be enough flow at any time to keep detritus from forming. IMO, if you use a wave maker, which I recommend, you may need more fan, or bigger ones to make up for the fact that they don't all run at the same time.

 

[Rich42082]

I'm getting really good flow now with the timer set to 15 seconds simultaneously. The only problem now is the air bubbles that form where the water crashes.

 

[Rich42082]

I've changed my PH to have continuous flow and I took off the timer. I'm now getting better flow. I'm planning on buying two 750 koralias and hooking them up to the timer. This should give me a better result.

 

[Gregcoyote]

It's hard to have too much flow. I kind of use the rule; turn it up as far as your can until the sand starts moving then back off a notch.