Powerhead placement

[btackerman]

Need some guidance in regards to powerhead placement. I have 2 macspect xf 250s and 3 dual headed powerhead a at 3500 gph and one single head that does 3200 gph. I have a 400 gallon system and I have tried several different placements. Any advice and what setting should I have the gyres set at. Below is a picture of my tank. Thank you in advance.

 

[Ron Reefman]

You say you've tried several different placements.
What were they and what was wrong with them?
You have 6 big water moving pumps, even in a 400g tank, it shouldn't be too hard to make things work.

 

[btackerman]

My biggest problem is in the intersections of the dual power heads. It will blow my sand all over the place and I did have some deadspots. I have tried all Powerheads on the back of the tank and the gyres on the sides.
Gyres centered on the sides and a Powerhead in each corner.
The gyres centered but vertical.
Each one I had sand in the center of my tank blown out

 

[Ron Reefman]

Slow the pumps down.

How new is this set up? Sugar fine sand will move around a lot for the first 2 to 4 months. but it will get better and more stable over time.

 

[btackerman]

Slow the pumps down.

How new is this set up? Sugar fine sand will move around a lot for the first 2 to 4 months. but it will get better and more stable over time.

10 months, with my 180 flow was easy but now since I’m adding 2 ft in width and a 1ft in height. It has been difficult for me

 

[btackerman]

2 of my 3200 gallon powerheads broke not sure how but Dutton my feedings I got zapped and both where bad. So now 2 maxspect 250s and 2 pumps that do 3200 gph and 1 pump that does 1800 gph. Should I get more powerheads?