Originally Posted by Dave9365
I want to get a new filter for my 26G tank (Fluval U3). When I get it can I just set it up in the tank with my old filter still running and run both together until the bacteria has built up in the media (old and new sponges will be completely different shapes). How long would i have to leave the old one in there for?
Thanks in advance
You can just run both filters ... One becomes a backup if The other breaks. If you still want to replace the original, run them together for about a month. Or stuff the old filter media with your new filter and it's media to seed the BB ... Again give it a month before removing the old media.
75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.