what's a minimal size refugium for a 55 gal tank? i know bigger is better, but i'm kind of pinched for room right now. what's a good rule of thumb for these...if there are any?
any size refugium is better than none but you need to know the reason for wanting a fuge. if it is for pod population than it doesn't need to be very big. if it is for nutrient reduction than go as big as you can. i have a 30 gal sump/fuge on my 55. the fuge side is about 8 gallons.
i'm mostly looking for nitrate reduction, with some sand, rubble, cheato, etc. so i suppose that the ones made from aqua clear hob's are not worth it? way too small?