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

Product ID: 256602740

Details

Brand
Fluval
Item form
Granules
Item weight
0.37 Pounds
Liquid volume
34 Liters
Number of Packs
3

💧Crystal-clear water clarity

🧪Research-grade carbon tech

♻️3-pack replacement convenience

Description

💧 Elevate your aquarium game with crystal-clear confidence!

TRUSTED LEGACY - From Fluval, pioneers of 3-stage filtration technology since 1975
EFFORTLESS MAINTENANCE - Includes three replacement carbon inserts to keep your tank sparkling without hassle
MAXIMIZED SURFACE AREA - Premium carbon granules engineered for superior impurity absorption
TAILORED COMPATIBILITY - Specifically designed for Fluval Spec, Evo & Flex aquarium series
ADVANCED CHEMICAL FILTRATION - Eliminates heavy metals, odors & pollutants for pristine aquatic environments

Fluval Spec/Evo/Flex Activated Carbon is a premium, research-grade chemical filter media designed exclusively for Fluval's Spec, Evo, and Flex aquariums. This 3-pack replacement set efficiently removes heavy metals, odors, discolorations, and pollutants, ensuring sparkling, crystal-clear water. Trusted by thousands with a 4.6-star rating, it combines advanced filtration technology with effortless maintenance to keep your aquatic environment pristine and vibrant.

Specifications

ASIN	B0049RIUWK
Allergen Information	Nut Free
Best Sellers Rank	#4,366 in Pet Supplies ( See Top 100 in Pet Supplies ) #142 in Aquarium Accessories
Brand Name	Fluval
Customer Reviews	4.6 4.6 out of 5 stars (8,318)
Global Trade Identification Number	00015561113779
Included Components	Fluval Spec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black
Item Form	Granules
Item Type Name	Fluval Spec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black
Item Weight	0.37 Pounds
Liquid Volume	34 Liters
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	A1377
Model Number	A1377
Number of Items	3
Number of Packs	3
Pet Type	Fish
Target Species	Fish
UPC	015561113779
Unit Count	3 Count

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