Sorry one more - does this have any affect on the fish?

To much Co2 can kill fish you can get a inexpensive drop bell co2 sensor. Fluval makes a plastic one but most a glass. They work off a chemical reagents. Depending on the size you fill the bell with aquarium water and a few drops of the chemical that simply changes color from blue low co2, to green safe co2 to yellow high co2. Depending on the model it suctions cup attaches or hangs on the aquarium to sense co2 levels hope this helps.

how long last each bottle?

The bottles will fill the diffuser 55 times. If you fill the diffuser twice a day as most recommend the bottle should last about 27 days.

Can anyone tell me how long a cartridge lasts in a 15 gallon?

depends on how high you turn it. I use mine with a different diffuser since the diffuser it comes with blows. basically you're paying for the thing you screw it into. One the bright side, you can buy 16 oz co2 cartridges for dirt cheap instead of the expensive 20oz refills from fluval. seriously, if you do that it's a worthwhile buy. Instead of getting 3 for 12 you can get thirty for 20 or so.

What's the largest cartridge that I can use in this? Can the 88g fit?

The biggest that can fit is the 20g cartridge, unless you can find the same thread size on another cartridge, but good luck in your findings. The 88 g cartridge thread size is too big for the valve that the 20 g comes with.

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Hagen FL Mini Pressurized 20g CO2 Kit

Product ID: 4598329

Details

Brand
Fluval
Item Form
Gas Cylinder
Item Weight
11.52 ounces
Number of Packs
1
Unit Count
1 Count

💧Ceramic diffuser for efficient CO2 dissolution

🧪20g CO2 cartridge for precise dosing

⚙️Regulator valve for controlled CO2 output

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Description

🌿 Elevate your planted aquarium game with precision CO2 control!

ALL IN ONE KIT - Includes regulator, bracket, cartridge, hose, and diffuser for effortless setup
TRUSTED LEGACY - From Fluval, pioneers in aquarium innovation since 1975
PRECISION CONTROL - Regulator valve ensures consistent and customizable CO2 flow
COMPACT POWERHOUSE - Mini pressurized CO2 system perfect for aquariums up to 15 gallons
MAXIMIZED ABSORPTION - Ceramic diffuser optimizes CO2 dissolution for lush plant growth

The Hagen FL Mini Pressurized 20g CO2 Kit is a compact, easy-to-use CO2 supplementation system designed for planted aquariums up to 15 gallons. Featuring a precise regulator valve and an efficient ceramic diffuser, it ensures optimal CO2 delivery to promote vigorous, healthy plant growth. The complete kit includes everything needed for quick installation, backed by Fluval’s decades-long reputation for aquarium innovation.

Specifications

ASIN	B0049RL3H4
ASIN	B0049RL3H4
Allergen Information	Nut Free
Best Sellers Rank	#195,169 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,521 in Aquarium Water Treatments
Brand Name	Fluval
Customer Reviews	3.9 3.9 out of 5 stars (832)
Date First Available	August 18, 2004
Global Trade Identification Number	00015561175401
Included Components	HAGEN FL MINI PRESSURIZED 20G CO2 KIT
Item Form	Gas Cylinder
Item Type Name	HAGEN FL MINI PRESSURIZED 20G CO2 KIT
Item Weight	11.52 ounces
Item model number	A7540
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	A7540
Model Number	A7540
Number of Items	1
Number of Packs	1
Pet Type	Fish
Product Dimensions	2.7 x 5.4 x 8.1 inches; 11.52 ounces
Target Species	Fish
UPC	015561175401
Unit Count	1 Count
Warranty Description	Manufacturer Warranty

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SAR 298

Duties & taxes included

In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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