I have 4 powerheads that were inherited from a friend. Two different kinds, but I have no idea what they are. What features would the different powerheads have that would make a difference, other than the wattage of course?
I've been looking for something that keeps the water moving when the power goes out ever since I lost some of my brand new coral that I got on the last coral trade in SF (Not the one we just had) with a power outage during a heatwave early this summer. I was really bummed because they were...