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Comments
Re: Water inside my extenal filter...
Yes you need to dump the dirty water and fill it with clean water. the bacteria is actually in the white cylinder media.
Re: Water inside my extenal filter...
I have the same external Fluval 304. I clean it about once every 3 or 4 months. I disposed of the carbon puches and just filled it with the white porous cylinders. I wash them off a little and put them back in and then fill it with water. Works great. Had it for over a year.
Re: Water inside my extenal filter...
I work in a fish store! We have 3 fluval display tanks all with externals, and it doesn't happen to any of them!
That's why I thought i'd ask, seems odd.
Reply
Thats utterly weird. I've never heard of that happening. And yes to your questiion. You are supposed to empty the filter
when you clean it. Try that and if that doesn't work contact a local pet store clerk. Best of Luck!!!