i have been struggling to alter my sump to include a refugium and am now back up and running with a plain sump again, i want a refugium and have seen threads where guys are talking about them which hang on the back, presuming they can hang on the back of the tank, if this is the case are they any good or not, ive seen a couple of different types which are quite small and i could easily fit on my tank but dont want to bother if its well basically garbage, any views on this will be gratefully recieved
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