Which powerhead should i get?

[Andezzzy]

i have a hydor koralia 1 and 2 in my 55gal reef i was thinking of getting another but i don't know if i should get a 3 or just another 2... what do you guys think?

[madfronter]

I have two 4s running in my 55 gallon tank and it is a very nice amount of water movement. I don't really have and dead spots in my tank with them running. The only slight dead spot I really see in my tank is in the bottom back left corner of the tank. Though that's where my heather is located and some live rock that displaces the water flow in that area. I would recommend a 4 to go along with your 1 and 2.