1200 gph will only be a gental current out of two 1" holes. you need an ampmaster to get what you are expecting I think. you can try plug two holes or three and see what the flow is like from 1 pump but remember if you double the size of the hole you increase the flow capability by 4X if i remember that rule properly. I have a magdrive 5 doing the closed loop on my 25 gal an d to get deicent flow i had to go to five 1/4" holes.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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