I found this on Amazon and am currently waiting for it to be delivered. I’m going to use it in my 10 gallon aquarium with a Betta, two green corey cats and 4 neon tetra. https://www.amazon.com/Elive-Aquarium-Aquaponics-Cartridges-Hydrocorn/dp/B00IK5QRFY/ref=sr_1_13?ie=UTF8&qid=1537880874&sr=8-13&keywords=Elive+aqua+duo+filter