You will have to decide what type of skimmer you want ( i built a dual Beckett for my 300G ) HSA / Countercurrent / venturi etc
The size of the tank is important and also how much room you have to place the skimmer ( efficient countercurrent skimmers can be up to 6' tall ) ...
in choosing to go Beckett I decided that I did not want to deal with air pumps/air stones and would gladly pay more for a bigger water pump to drive it if it required less maintenance ... also the size I would need in any other style for my size tank was not an option ... another factor was noise as I had a venturi style previously and the hissing noise was unbearable
you have to look at your tank and what you are willing to give up or pay to get what you want ... a google search or major forum search will yield lots of designs
If you do decide on a Beckett style I would be happy to show you the one I built and how I built it.
Cheers
__________________
Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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