Has anyone used this long-term? Thoughts-?

Yes I've used "one", for a year and a half. very effective for plant growth. Simple to use, however it's almost impossible to find additional CO2 cans without having to buy the whole kit.

can i use a glass diffuser instead of the 2 big plastic containers

i tried using an aftermarket glass diffuser but didnt work :( i guess the pressure in the cans arent enough pressure to push through the glass. Well I also guess it depends on the type of diffuser but didnt work for me

Can anyone tell me, would this diffuser work with a 55 gallon planted aquarium? Any other hints or advise would be greatly appreciated.

Hello Robert, To be honest this is what I found regarding this product. We have thousands of products so based off of the manufacturer description this is what I found. "Gulfstream Tropical AGU00512 Ista Co2 Diffuser SetCo2 Diffuser Set A perfect CO2 supply for small planted aquarium or beginners simple to set up and operate extendable CO2 diffusing chamber provides options of CO2 supplying rate. Include 1 can pressurized liq 1 check valve, 1 CO2 diffuser 1 flexible tube.Features Ista co2 diffuser set Indisputable quality and reliability These are the most practical diffusers available "I think it is mostly for a smaller space. 55g is quite large, I believe this is better suited for small/med aquariums. Hope this helps. Gabriela

Is there replacement co2 cans?

I also tried to find replacement but only could find the whole set including the diffuser. However it seems to be a good deal anyway, as the set can be compared to other brands CO2 bottles only, for a cost stand point.

Gulfstream Tropical Agu00512 Ista Co2 Diffuser Set For Aquarium

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Description

🌿 Elevate your aquarium game with precision CO2 diffusion!

BUILT TO LAST - Crafted with precision for unmatched durability and consistent performance.
BOOST YOUR AQUASCAPE - Enhance plant growth and vibrancy, creating a stunning underwater landscape that turns heads.
TRUSTED BY AQUARISTS - Join thousands of enthusiasts who rely on ISTA’s proven quality and reliability.
PLUG PLAY PRACTICALITY - Ready to use out of the box—no extra components needed to elevate your aquatic ecosystem.
EFFORTLESS CO 2 INTEGRATION - Seamlessly infuse your aquarium with ultra-fine CO2 bubbles for maximum plant absorption.

The Gulfstream Tropical ISTA CO2 Diffuser Set delivers ultra-fine CO2 bubbles designed for optimal absorption in planted aquariums. Engineered for durability and ease of use, this compact diffuser ensures consistent performance to boost aquatic plant health and vibrancy. Ideal for young adult aquarists seeking reliable, practical solutions to transform their underwater environments.

Specifications

ASIN	B005DGJBYW
ASIN	B005DGJBYW
Age Range Description	Young Adult
Best Sellers Rank	#281,268 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,952 in Aquarium Water Treatments
Brand Name	ISTA
Color	White
Customer Reviews	3.5 3.5 out of 5 stars (117)
Date First Available	July 19, 2011
Date First Available	July 19, 2011
Directions	Ship ground only using an ORM-D label
Included Components	No additional items required
Is Discontinued By Manufacturer	No
Item Dimensions LxWxH	0.02 x 0.02 x 0.02 inches
Item Package Dimensions L x W x H	9.5 x 4.8 x 2.9 inches
Item Weight	9.07 g
Item model number	512
Item model number	512
Manufacturer	TopDawg Pet Supply
Manufacturer	TopDawg Pet Supply
Model Name	ISTA
Product Dimensions	0.02 x 0.02 x 0.02 inches; 0.32 ounces
Specific Uses for Product	CO2 for planted aquariums
Target Audience Keyword	Fish, algae-eaters
Warranty Description	30 days after initial purchase

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