The water is just turbulent (which is still better than the constant flow from my old powerheads).
I'm not really seeing the swaying back and forth effect at all. Unfortunately you can't program in "rest" time (i.e., both pumps off for x seconds). They take turns turning on and off for something like 10-15 seconds at a time. Right now I have both positioned on either side of the tank facing each other (your typical setup). They have the ability to pair so there's a master/slave setup. This allows you to direct the water flow where you want it to go.I just purchased two Jebao OW-25 for my 525XL.
This clogs the unit creating even more restricted water flow, and overheats it prematurely decreasing the life of the unit. This can be further complicated by tank matter clinging to the strainer. Ones that are too small can slow the water intake. Check the size grid of the holes on the strainer and choose the larger sized one. Be sure the powerhead has a strainer or screen of some type that covers the water intake hole to prevent unwary tank inhabitants from getting sucked into it.Once again, pick a powerhead that can be taken apart and put back together easily. Periodically parts may need to be replaced after prolonged use of the unit. Choose a powerhead that you can order and replace the parts on.Look for ease of cleaning to prevent restricted water flow, which in turn can lead to the unit burning out prematurely from overheating. The unwanted matter at times can enter the impeller area and needs to be removed. Pick a powerhead that can be taken apart and put back together easily.Be sure the powerhead you choose is saltwater safe!.Choose a powerhead that is properly epoxy sealed and moisture proof to ensure no electrical leakage into the aquarium.
These units may cost a little more than the bargain brands, but worth the investment. Choose ones made by respected manufacturers, such as Hagen ( Aquaclear), Marineland ( Penguin), Aquarium Systems ( Maxi-Jet) and Rio ( read product reviews & compare prices), that are time-tested, reliable, and most likely won't burn out in a short period of time. Don't go with an off the wall brand name.Powerheads can help deter the growth of algae, as some types grow better in calmer, less turbulent water.The water movement and current provided by powerheads are a source of exercise for fish.Position them appropriately in your tank. Many corals and anemones do not do well in high current areas, while others thrive on good strong current. Water moving over the animals helps to carry oxygen to them, brings food to stationary animals, and stimulates animal activity. They aid in the health of the tank inhabitants.Powerhead circulation permits the majority of these particulates to be circulated or suspended, allowing them to be filtered out by a mechanical filter. They help to keep detritus and other tank matter from settling on the bottom of the tank.The more your tank water is circulated and filtered, the better the water quality is in the aquarium.Powerheads provide important water circulation and oxygenation in the aquarium, far more efficiently than the bubbles from air stones do.
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