i general go by
10x (gph flow) is low
20 - 30 - medium
40x+ high flow
that is based on # of gallons. So say, 20 gallon tank needs 200 gph of water movement for 10x (low) flow. 400 - 600 gph flow for medium and 800 gph+ for high flow.
Thats a good tip to keep handy. What about what different species need? Does anyone have a chart of if certains species of coral are low, medium or high flow?
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