Help with MP40

[twiddle]

I just purchased a an MP40 for my 72 gal 4 ft wide mixed reef. Setup was easy but it now seems that my fish only stay on the far half of my tank. It is only set to about 4 but the fish seem to stay far away.
I would lower the speed it but I don't think much flow is making it all of the way to far side of the tank.
Any ideas?
Another question is do I need a Slave to get the full benefit of the EcoSmart modes?

 

[bluebastion]

I have an MP40 on my 4ft 67 gallon and I have it set to the LED #4 because if I do any more it moves the sand around. I think 2xMP40's is best since you can have more water movement with less sand movement.

Also when it comes to fish and these pumps... I think it best they stay away. I've found a dead cardinal stuck to the intake side of the pump.

 

[twiddle]

Mp40

Mp40

I am not having any sand issues with it. I have the pump about 6 inches below the water line.
I set it to Lagoon Random and this seems to be a better since it goes from strong to slow. It is set to 5 right now.

 

[Eurobeaner]

I have 2 mp40's on a 75 gal (48x18x24) on about 80% reef crest. I have 2 clowns, 2 small tangs, a spotted mandarin, and a small goby. None of which seem to mind me blasting them with ~2500gph each... The mandarin will even get up near it when it's roaming around and it will turn all the way up and he struggles but swims away easily.

 

[bluebastion]

I am not having any sand issues with it. I have the pump about 6 inches below the water line.
I set it to Lagoon Random and this seems to be a better since it goes from strong to slow. It is set to 5 right now.

Yeah my 67 is only 18" deep... so not sure if that's why I'm having issues. I have it on Nutrient Transport mode.