Dead spots

I'm using 205 xternal canister filter in a 47 rectangular and I don't think there's
enough movement . I have some brown on my sand which i guess is diatom.
So i was thinking maybe i need a secondary pump and if so what would be good to use that wouldn't be too much movement? Thanks for any help

 

Just use a powerhead. Diatom on sand is normal.

 

Depends on budjet...

Basic powerhead or setup a wavemaker.

http://www.marinedepot.com/JBJ_Ocea...Powerheads-JBJ_Lighting-JB6331-FIPHFF-vi.html

http://www.marinedepot.com/Hydor_Ko...m_Powerheads-Hydor_USA-HD00717-FIPHFF-vi.html

BEST OPTION:
http://www.marinedepot.com/EcoTech_...werheads-EcoTech_Marine-EM1251-FIPHAD-vi.html

 

If this is a new tank set up diatoms on the sand is very normal.If yout cannister is your only source for water flow a powerhead or two would be a good addition,especially if you would like to add corals.

 

Thanks, I'll get a powerhead for now, I would like the MP10 but jeeze 230 have to save up for that .

 

Hydor Coralias or Maxi Jets. The new Maxi Jets work as pumps or powerheads and are VERY affordable.