Reef Tank Flow & Powerhead Placement Guide
Water flow is one of the most underrated parts of a healthy reef tank. At Tropical Treasures in Cheyenne, we see plenty of tanks where good corals struggle simply because the flow is too weak, too strong, or pointed the wrong way. Get it right and your corals, fish, and water quality all benefit.
Why flow matters 🌊
Moving water delivers oxygen and food to your corals, carries away waste and detritus before it settles, and prevents dead spots where algae and cyanobacteria love to grow. It also keeps your whole tank evenly heated and mixed.
How much flow do you need? 💨
A common starting point is turning over your tank volume about 20-40 times per hour for a mixed reef, though SPS corals like more and softies prefer less. The goal is random, turbulent flow that reaches every corner — not a single fire-hose blast in one direction.
Powerhead placement tips 🔧
Aim powerheads to cross or bounce off the glass so currents mix rather than collide head-on. Keep nozzles off the sand bed to avoid sandstorms, and point some flow toward the surface to boost gas exchange. Adjustable or wave-making pumps let you vary the pattern over the day.
Signs your flow is off ⚠️
Detritus piling up in corners, stringy algae or cyano patches, corals that won't open, and fish that look like they're fighting a current all point to a flow problem. Watch how your corals' tissue and polyps move — gentle sway is good, violent thrashing is too much. Browse our pumps and powerheads or call 307-369-1118 for help choosing.
Is your current setup enough? 🤔
If you have dead spots or sluggish corals, adding a second smaller powerhead on the opposite side often fixes things better than one big pump. Variety and coverage beat raw power.
The bottom line ✅
Good flow keeps your reef clean, oxygenated, and thriving — aim for random, turbulent water that reaches every corner without blasting your corals. Need help picking the right powerhead? Stop by Tropical Treasures in Cheyenne or call 307-369-1118, and find more reef tips on The Tank Buddy Blog.