Does this fit the fluval 13.5 gallon evo?

I use it with a 9 gallon fluval tank. It works.

i have Top Fin filter on my 20 gallon tank , well i really dont know where do i place this carbon ?

Carbon should be the last thing the water touches before returning to the tank with the exception of a polishing pad. This is so ammonia and nitrite can be processed by the food bacteria before the carbon leeches it out of the water. Each filter is different so look at how the water flows in your filter for best placement.

How often does the foam filter need to be replaced?

For the health of your fish you should replace the mechanical filter, the foamy thing, at LEAST every 2 months. This isn’t a sweater that you wear and replace when it’s worn out. Who ever gave that advice doesn’t know their @$$ from a hole in the ground.

Is it possible to cut a third opening in the middle for an additional biomax bag?

Yes you could but that would mean you would have very little mechanical filtration. There won't be enough media left to filter anything.

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💧 Elevate your aquarium game with crystal-clear confidence!

PREMIUM SURFACE AREA - Maximized absorption power with research-grade activated carbon
SAFE ALLERGEN FREE - Nut-free, non-toxic granules suitable for all fish life stages
EFFORTLESS MAINTENANCE - Includes three replacement inserts to keep your aquarium sparkling
TAILORED COMPATIBILITY - Perfectly engineered for Fluval Spec, Evo & Flex aquarium series
ADVANCED CHEMICAL FILTRATION - Eliminates heavy metals, odors & discolorations for pristine water

FluvalSpec/Evo/Flex Activated Carbon 3-pack offers premium, research-grade carbon granules designed specifically for Fluval desktop aquariums. This chemical filter media efficiently removes heavy metals, odors, and discolorations, ensuring sparkling, crystal-clear water. Each pack includes three easy-to-replace inserts, making maintenance seamless and keeping your aquatic environment pristine and healthy.

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Pet Type	Fish
Product Dimensions	30.48 x 10.16 x 17.78 cm; 164.99 g
Item model number	A1377
Pet Life Stage	All Life Stages
Item Form	Granules
Allergen Information	Nut Free
Color	Black
Size	Evo/Spec/Flex
Volume	18 Fluid Ounces
Number of Items	1
Quantity	1
Specific Uses	Indoor
batteries required	No
Batteries Included	No
Item Weight	165 g

FluvalSpec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black

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