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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💧 Elevate Your Aquarium Game!

COMPACT POWER - Perfect for small planted aquariums up to 15 gallons.
EFFORTLESS SETUP - User-friendly installation for hassle-free enjoyment.
PRECISION CONTROL - Regulator valve ensures optimal CO2 output.
COMMUNITY FAVORITE - Join fellow aquarists in creating vibrant underwater worlds.
SUSTAINABLE GROWTH - Enhances plant health and aquarium aesthetics.

The HAGEN FL Mini Pressurized 20G CO2 Kit is designed for small planted aquariums, providing a reliable and efficient CO2 supply with 55 refills from a compact 20-gram cylinder, ensuring your aquatic plants thrive effortlessly.

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