How frequent this should be changed? since its carbon impregnated.

Fluval says once a month... To me It all really depends on water change regime.

Do these also fit the fluval fx4?

Every single part/pad etc made for FX4/5/6 are interchangeable with the exception of the pump motor for FX4. Everything else and I mean everything else fits all FX series.

Can this be used for preparation for an Axolotl? And if so, is it recommended?

I am not sure. Using it helps in toxic ammonia. Your critter lives in murky, muddy water I believe. Ammonia can build up anywhere. You might get contact your pet store. Sorry

ASIN	B001602BUK
Allergen Information	Nut Free
Batteries Included	No
Best Sellers Rank	#23,632 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,150 in Aquarium Accessories
Breed Recommendation	All Breed Sizes
Color	White
Customer Reviews	4.7 4.7 out of 5 stars (1,635)
Date First Available	6 August 2012
Flavor	Geschmacksneutral.
Item Weight	68 g
Item model number	A246
Number of Items	1
Pet Life Stage	Adult Dogs
Pet Type	Fish
Product Dimensions	17.27 x 17.27 x 8.89 cm; 68.04 g
Quantity	1
Size	3 Count (Pack of 1)
Special Features	Lightweight, Portable
Specific Uses	Indoor
batteries required	No

Water Polishing Pad for Fluval FX4, FX5 and FX6 External Filters

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