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How to use Imagitarium ammonia-reducing cubes in a 5-gallon filter?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Male

I just purchased Imagitarium Ammonia-Reducing filter media cubes from Petco and there are no instructions for how to use. I have a 5 gallon tank with a submerged Built-in filtration system how many cubes do I use and how do I put them in my filter? Please provide the instructions thank you for your time.

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on August 1st, 2018

These cubes are typically placed in the filter or directly in the water flow. The filter should have a compartment that can be opened to remove filter media. Without knowing the brand of filter, more accurate advice cannot be given. The cubes begin to work immediately to reduce ammonia levels but they should not be used as a long term solution. Monitor water chemistry using a home test kit or by submitting a water sample for testing. Most pet stores will do this for free or for a small fee. Aim for 0 ppm ammonia and nitrites with a nitrate level of 20 ppm or less. Perform partial water changes, no more than 30% at a time, to stabilize chemistry and/or to improve water quality. Use only aged or conditioned water that is temperature matched to prevent stress or shock. This would be recommended over using another method.

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