must have items....

[OrionN]

Pattern of water flow from a propeller type PH (low speed high volume) is a lot more natural that that of centripetal pumps/close loop (high speed low volume). Another problem with the CL is that the amount of water intake is high. Diffusing this intake requires a large screened area or else fish and invertebrates can get suck in and kill. This intake cannot be place in the overflow box due to problem with take in air bubbles; it has to be in the tank itself. Failure (most often at the attachment to the pump or failure of the pump) can and will empty the tank.
I was one of the earlier reefers who used close loop way back in 2000. It works OK but I like dump buckets then propeller type PH much better. I used a closed loop in the tank below.
http://www.advancedaquarist.com/2002/1/aquarium

[Scutterborn]

Nice write up, Minh.


- Ben -

[allan]

Really good write up. Enjoyed reading the article.


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[OrionN]

Thanks. I just want to tell the OP that I use CL before, I will have the 400 dollars automatic valve (1.5 inches 3 way valves) to redirec the flow every few minutes. It works OK but I think current PH works a lot better.