Hi everyone, i'm a longtime reader, 1st time poster, and i need your help. I have a 40Gal acrylic long aquarium that i have setup for my Peacock Mantis Shrimp. it has live rock and live sand and nothing else. Im using a H.O.B marineland 150 filter(Rated for 30 gallons but i've had this setup for 3 months now). I do Biweekly PWC
of 25% or 10 gallons. Everything is fine except for my airstone. I know SW
needs surface agitation for oxygen exchange. So my question is; Can i replace the airstone with a Hydor Koralia 2 powerhead? the reason why i ask is because the aquarium is in my bedroom and the Whisper 40 Air Pump (Tetra) is keeping me up at night. I really appreciate everyones input on this and i'll post up pics pretty soon.