Wow so many opinons with alot of good advice and i do agree i have #2 for spor flow and had worked great and would reccommed one but to many put the reef tanks water quality and flow in jepordy with out the right amount. 2 #4's in a 120 or was it a 150 i saw in one thread is way to low. A another used for a wavemaker is always a regular topic in RC as they just done keep the job done.
They are a great tool in reef keeping and have there place in reefing but keep in mind its the amount a flow the whl tank recieves not just the open areas you see.
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Lance H.
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