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Do I need a sump


kiwis

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Depending on the size of tank a sump isn't always required but I wouldn't replace this by using a canister filter. In smaller tanks you can get away with more frequent water changes to maintain stability but in bigger tanks a sump is usually preferable. Canister filters can be used but require regular maintenance as they become a trap for waste which then causes more issues than you would have had without it. Also if using a canister filter I would remove sponges and run with coral rock or carbon. 

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8 minutes ago, kiwis said:

I don't have much room under my tank so wanted a stand alone one if possible. I don't want a hang on the back skimmer though. 

Do you know of a stand alone one that's not hang on the back?

I think the reef octopus external skimmers are generally good mid range external ones. 

http://www.marinedepot.com/Reef_Octopus_Classic_110_EXT_Recirculating_Protein_Skimmer_In_Sump_Protein_Skimmers_for_Aquariums_Reefs-Reef_Octopus-CV5131-FIPSIS-vi.html

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