Power head question

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Apr 22, 2015
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Santa Ana
#1
I have a 40 gallon long (36x18x16). How many power heads and how many gph should they be rated at. I can't afford a top of the line model. If you could suggest a budget model I would really appreciate it. I have 3 chromis in the tank with 25lbs of live rock. I plan on doing easy corals in the future.
 
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