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Jay- i am so confused.:D

i think your pump is to much for what you want. it could be used for closed loop system or to power a skimmer, but as a return a little much. that is close to 35X circulation in a 20g!:eek:

do you have a skimmer yet? i think a hang-on would be your best bet unless your stand is large enough to handle an external skimmer off of the sump/refugium.

the idea of splitting the overflow to 2 seperate compartments is a good idea. i would divide the 20l in half. i would have the divider stop 2-3 inches from the top of the tank so that the water can overflow into the sump area. the sump area will contain your pump and heater. the water from the overflow will be split so that you can control the flow to the refugium section, while the rest goes into the sump. with half of the tank used for sump overflowing should not be a problem if the power goes out.


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