12-13-2009, 05:58 PM
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Originally Posted by willieturnip
Your overflow will only syphon out what you pump in to the tank. If you have a 400000 GPH overflow it will still only draw into the sump what you pump back from the sump. I figure you might as well just get the biggest you can realistically fit in the tank.
What's the point of lowering the flow from your return pump? You might as well just get a pump with less output as it will probably be cheaper and there's no valve to eventually cause problems.
Will, which prefilter would you reccommend? Even the cs50 I suggested will still look bulky on a 15 gallon. Do you have experience with a smaller one that has a failsafe?
I would always suggest putting a ball valve on a return pump, along with a check valve. The ball valve can help you slow down flow for feedings and Water Changes and such.
The problem I see with going with an overflow siphon that's way too overrated is the flow being too slow. This would result in bubbles building up in the siphon and eventually causing a siphon break. Also, you want some type of turnover rate in the tank, and a 300 GPH pump would provide better than say 150.
I used a 600 GPH overflow with a 792 pump fully open for over a year. Never had a problem.