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#1
02-23-2007, 02:53 PM
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I think I understand this issue. I have noticed the same thing with my sump baffles when the water level gets lower. The water flows out from the baffle instead of down it, and this causes micro bubbles and noise. You know what I've noticed cures this? I run my finger along the top of the baffle and whamo! the water now flows down it. Can't explain why, but it works. I know, its not a reliable solution but it leaves me to believe that friction may have something to do with it. Have you considered rounding out the edge of the overflow?
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THE BARQUARIUM: 55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's. Fully stocked with fish, corals and usually some fine scotch http://www.canreef.com/vbulletin/showthread.php?t=55041 
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#2
02-23-2007, 05:32 PM
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My 1260 (one model up) is extremely quiet. I haven't measured it, but my Eheim's head pressure is amazing and probably underrated a bit as opposed to most other pumps which overrate.
I also believe the 1250 also uses less electricity than the other pumps your are considering and will probably last forever. Finally, you can run it externally if you wish. Of course it costs more, but you get what you pay for. I am also a proponent of the "slow flow" sump. I've probably only got about 400gph or so going through my 35 (filled) gallons of sump (150 gallons total system volume). This is with the Eheim throttled back about 10% and tee'd off through a UV recirculating back into the sump.
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