Do I need two Powerhead

Yes. All coral tanks, and in reality, all tanks, should have one or two (ideally at least 2)
 
Although my tank is larger (120DT/40sump) I use 4 powerheads and a pair of Gyre 250's to get the random flow needed to prevent dead spots where detritus can accumulate. IMHO, one power head is never enough. 2 or more will give you much better results. You should be aiming for somewhere around 30x turnover in a LPS or soft coral tank, and at least double that for SPS. My tank averages 70+x turnover and briefly peaks about 100x.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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