i used purigen once and there were tiny little balls all over the place, even though i used the purigen bag it didnt matter to much.
its kinda fun to play with tho
i use HOB filters on all my tank, FO and reef. the kind with the disposable cartridges. i get the topfin brand at petsmart, its a knock-off of the whisper filters, better and cheaper.
been using hob on my reefs for 3 years and no problems yet.
i change out the cartridge every three weeks and run carbon or phosban for a few days.
i dont have tangs so i wouldnt know about the carbon and HLLE
i will tell ya one thing though, a few years back on my cichlid tank, i would run chemipure carbon all the time, and 90% of my cichlids came down with hole in the head disease.
i ditched the chemipure and ive never had another fish with it again...coincodence??? not sure, could be, but its not worth it to me to risk it
oh yeah and i run a cheapo prizm skimmer :lol: