Thinking of adding/changing flow.

[LoveReefer]

Hey guys.

Thinking about asking Santa for a second MP40WQD for Christmas. Right now I have one MP40WQD that is in the back center of my 90 gallon and one small koralia on the bottom side pushing water along the back of the tank. I switch between reef crest and lagoon mode at 60%-70%. Corals seem to be liking the flow, with minimal dead spots but with it being on the back, my sand in the front hates it lol. If I turn the flow down to about 30% the sand stays put but that's not enough to move the water all over my tank in a way I would like. I would ideally like two pumps on the back glass turned down at a lower rate to achieve flow throughout the tank(aesthetic reasons) . I'm not against a pump on each side either though. I would definitely need a second MP40 IMO if I wanted to use the sides. These things aren't cheap lol...Is it worth getting a second pump? Is two MP40s overkill?

 

[AdamNC]

I run 2 MP40S on a 40 breeder. They have a speed knob on them so you can slow the speed down as you know. I max mine out at 50% so I think you’ll be fine.

 

[Hemmdog]

100% get another mp40. Opposite sides work best.

 

[Reef.]

Could a mp10 not work? Cheaper, if you are running the mp 40 at reduced speed

 

[Waters]

As stated, add a second on opposite sides having them collide in the middle. You sand is being moved because the water is just hitting the glass and going straight down. If you have the two hitting in the middle, you will get more chaotic flow.