If you want to experience the explosive growth and vibrant colors of a high-tech planted tank but aren’t ready to deal with pressurized cylinders or complex tubing setups, Dr. Tank #3 CO₂ Fertilizer Tablets are your shortcut to success. These clever, effervescent tablets drop straight into your aquarium and fizz for about 20 minutes, releasing a rapid cloud of pure carbon dioxide directly into the water column.
For the best results, drop the tablet directly into an area with high water flow (like right near your filter's output nozzle or powerhead) to distribute the dissolved carbon evenly across your aquascape.
| Aquarium Water Volume | Single Tablet Dose Rate | Weekly Frequency Protocol |
| Nano Tanks (<14 Gallons) | 1 Tablet | 1x Per Week |
| Medium Tanks (15 to 25 Gallons) | 1Tablet | 2x Per Week |
| Large Tanks (>25 Gallons) | 2 Tablets | 2x Per Week |
Can be used as a standalone carbon source or alongside a pressurized CO₂ regulator system
Overall rating: 4.909091 / 5 from 11 reviews.
Review topics: ["co2","growing"].
"My dwarf hair grass took off within days of adding these in, great product!"
"Good product i use this in my tank with liquid fertilizers and my plants grow very well"
"Everything is perfect"
"Sorry I have not used it yet. I bought it because I have a 20 gal Hex tank, small foot print and there would be too much piping going in & out of tank. My thoughts are this will the CO2 answer for my plants. I received my order in 2 days whereas the order to a different vendor still has not arrived. I will be using you more in future. Thank you for being efficient. Just getting back in hobby after the cats are now gone. They learned to take the lid off tank & destroyed my aquarium & killed my fish."
"Gives extra co2 for my planted tanks. Works really well along with the Aquario Neo co2 injection."
"Seems to be working better than the other CO2 tablets I've used in the past."
"I have only been using this product a short time but already all my plants in my 10 & 5. 5 gallon aquariums are looking better"
"So far it sems to be helping my plants. Always pleased with Buceplant!"
"These drop in tabs provide an easy method to deliver CO2 and carbon into your aquarium. I used these while waiting to set up my CO2 system and was pleased with the results."
"Used it the first two weeks after initial planting of my tank. Plants showed strong growth in addition to using Thrive AIO. I’d recommend to use it during cycling but not once you have livestock as you can’t gauge the amount of co2 these tablets release."
