Powerheads?

s.a. boy

Member
What size powerheads should I use in my tank to get a good circulation in my tank.
Tank size : 400 l (100 gal)
At the moment I have 4000 l/hr pump from my sump to the tank and a powerhead 302 in my tank for circulation?
Do I need another powerhead in my tank? IF what size should it be?
 
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