I'm building a pond 10ft wide x 14ft long x 3.5ft deep. It's said that you should pump half your volume every hour. My question is how much is too much as far as GPH goes in a pump?
If it's sucking your fish into the impeller, then your pump is too big!!!
All joking aside, I don't worry about too much about more pump than you need. The fish love the challenge of swimming upstream.
I just added a 350 gph filter/pump to a 50 gallon aquarium with about 70 small Koi in it. They love it and I'm not the least concerned about the overkill.
My waterfall in my 650 gallon pond has a 3800 gph pump.
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