If your going cannistor route try ensure its rated to atleast the size of your tank or it will struggle to keep biological balance"this is where the external cannistors are in a league of there ownnot only are they large and powerful but they can contain an array of subtrate that will keep the tank very balanced" am currenttly running a flueval (250) but my tanks 200ltr and its purs like a kitten tests have all been pfect





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