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I've seen some pictures on prefilter overflow to the sump witha a U tube connecting the inflow to the outflow anddown to sump. Can anyone tell me whether you need a pump to draw the water down to the Biofilter Tower in the sump? Thanks Beginner

Thanks Ed for the reply. I just love this site. I live in Malaysia where there are few hobbyists to exchange ideas.The LFS here are not very helpful. They thrive on your ignorance so that you keep going back to buy treatments etc.They are unwilling to share their "knowledge"! If i were to covert...

I ahve a 30 gallon tank,1 pb tang,1 common clown,1 blue damsel,1 dottyback and 1 anemone some LR and coral sand.using currently Hagen Internal Filter and hang on Skimmer. Should I go for sump and discard the inetrnal filter. If I were to construct myself-can anyone show me how to build a sump...

I know this doesn't answer your question. What's a refugium? I run my 30 gallon tank using protein skimmer and Hagen Internal Filter. Have been using for 8months now with moderate success. Is this refugium thing differnt from sump? Would appreciate if you could provide say pictures of how this...