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sjungdahl
03/09/2015, 09:05 PM
How many water changes an hour should I shoot for?

180 gal reef
The pump I'm looking at would give me about 5 an hour at the head height I have.

Wazzel
03/09/2015, 09:10 PM
5x is a good amount. I got 6x in my tank. I try to target between 5 and 10 when planning the system. To slow and you do not get good exchange between the skimmer, heater and what ever else you got in the sump. To fast and you have noise and micro bubble issues.

pyithar
03/09/2015, 09:30 PM
like Wazzel said above 5 times is fine. add powerheads/wavemakers for flow in the tank depending on the types of corals that you're keeping.