I've read the sticky above and found it helpful. I've read some other articles about water turnover rate. I'm curious what the general opinion is about minimum flow and what you would think a max flow would be. I see the above post has 50x water flow and I've read that you should have a minimum of 6-10 times. If I try to go inbetween those 2 say 20X in a 125 tank (6ft length) I'd be looking at 2,500 gph I take it....
Your opinion on flow
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In my last tank I ran approx. 870gph in a 20g w/15g sump (actual gallons of water in system was 20g) that worked out to 43.5 times tank turn over per hour and I had a mix of LPS, SPS, Mushrooms and more. The key is to use powerheads with a high volume & low pressure flow... like a Seio or one of the new Hydors Korilia's. They move a lot of water but its flow is spred out and not concentrated in a small jet flow like a maxijet or the like.
In a 125g I would be using about 4 x "Hydor Koralia 4 - 1200GPH" or 4 x "Taam Seio 1100 Super Flow Pump" in that. For any low flow or medium flow coral just use the LR to make some shelterd areas.
In a 125g I would be using about 4 x "Hydor Koralia 4 - 1200GPH" or 4 x "Taam Seio 1100 Super Flow Pump" in that. For any low flow or medium flow coral just use the LR to make some shelterd areas.
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just to give u an idea in my 125g i have a koralia#3 on one end and a #4 on the other then my return pump (only 700 gph) in the middle facing both directions 
... i guess what u really need to figure out is what type of tank will this be? a FOWLR or a softie tank wont need as much flow as a sps tank
btw saltywaters 4x #4 koralias would be total over kill unless its all sps
... i guess what u really need to figure out is what type of tank will this be? a FOWLR or a softie tank wont need as much flow as a sps tankbtw saltywaters 4x #4 koralias would be total over kill unless its all sps