What size is best for a 40 gallon?

Large, it will last a bit longer..

Do I need to buy something for this to go in ?

Yes, you have to buy the filter and change them when they get thirty.

Can it be used in fish tank filter

These are replacement filters for the Tetra ReptoFilter. I have not have the chance to use it in any other tank filters.

Can you use this in a fish aquarium?

No , only if you wanna fill your aquarium a quarter of the way to full . This is for reptiles and such .

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Tetra ReptoFilter Cartridges - Medium 3 pack, green (25845)

Product ID: 278749211

Details

Brand
Tetra
Item form
other
Item weight
0.11 Pounds
Manufacturer
Tetra
Unit count
3 Count

💧Efficient water filtration

♻️Disposable & easy replacement

🛠️Dual-sided mesh debris catcher

€ 21.09

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Description

💧 Keep your reptile’s world fresh and flawless — because clean water is non-negotiable!

ODOR FREE OASIS - Advanced filtration removes odors, creating a clean environment for your reptiles.
TRUSTED SINCE 1951 - Backed by decades of expertise, ensuring reliable care for your exotic pets.
EFFORTLESS MAINTENANCE - Quick cartridge swaps every 4 weeks keep your habitat fresh with zero hassle.
CRYSTAL CLEAR WATER ALWAYS - Dual-sided mesh traps debris and waste for pristine terrarium water.
PERFECT FIT MAXIMUM PERFORMANCE - Medium size tailored for TetraFauna ReptoFilter 20 gallon and similar tanks.

Tetra ReptoFilter Medium Cartridges (3-pack) deliver efficient, dual-sided filtration designed specifically for turtle, newt, and frog terrariums. Easy to install and replace every four weeks, these disposable cartridges maintain crystal-clear, odor-free water in 20-gallon tanks and compatible filters, backed by Tetra’s trusted expertise since 1951.

Specifications

ASIN	B000HHLKRI
Allergen Information	Kiwi Free
Best Sellers Rank	#208,886 in Kitchen ( See Top 100 in Kitchen ) #728 in Water Filter Cartridges
Brand Name	Tetra
Customer Reviews	4.7 4.7 out of 5 stars (11,440)
Global Trade Identification Number	00046798258452
Included Components	Tetra ReptoFilter Cartridges (3 Pack) Medium
Item Form	other
Item Highlight	For TetraFauna ReptoFilter 20 gal, Viquarium & Decorative ReptoFilter, Removea Debris, Waste & Odors, Replace Every 4 Weeks
Item Type Name	Tetra ReptoFilter Filter Cartridges, With Whisper Technology
Item Weight	0.11 Pounds
Manufacturer	Tetra
Manufacturer Part Number	75025845
Model Number	25845
Number of Items	1
Pet Type	Reptile
UPC	046798258452
Unit Count	3 Count

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€ 21.09

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to GERMANY.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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