View Full Version : adding more powerheads

01/15/2008, 09:07 PM
Right now I have a Rio 2500 pump moving water through my sump. I'm estimating im turning my 65 gallon tank over 6 times an hr through the sump. How much more flow with in tank powerheads should I add? Is there a rule of thumb for reef tanks?

01/15/2008, 10:15 PM
Depends on what kind of corals you have and what your rock-work is like. If you have or want to keep a lot of SPS corals you'll need a lot of flow or surges. LPS and mushrooms tend to prefer calmer water. A couple of strategically placed powerheads can allow you to create different zones of current in the tank. It usually takes a little experimenting and does change over time as things grow.

01/15/2008, 10:19 PM
Not to steal a thread but I am new so I was wondering if I have a 72g tank and I have 2600gph of flow in it would it be:

2600 / 72 = 38x ?

I am just trying to understand what people are talking about when they say 20x 40x times

01/15/2008, 11:01 PM
yes, you are understanding the concept correctly.

01/15/2008, 11:13 PM
Turnover per hour says too little about the flow across the corals. Have a look at the water flow and light articles here...

You could be fine with some MJ 1200's with the Sure Flow mod's.

01/16/2008, 01:00 AM
6 times per hour is good for .... lets say a goldfish. LOL, if you are going to keep corals you want at least 20x-50x turn over per hour for softies and lps. For sps 50x-the point where the sand starts to move from the flow. Hope this helps you out.