How many gallons of water do you have inside your tank/tub?
https://www.amazon.com/gp/aw/d/B08PCKRLMD/ref=sspa_mw_detail_4?ie=UTF8&psc=1&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9kZXRhaWwyp13NParams
Here’s another: https://www.amazon.com/AquaMiracle-Aquarium-Aquariums-Direction-Adjustable/dp/B0B5T135YW/ref=mp_s_a_1_2_sspa?adgrpid=60098804590&gclid=EAIaIQobChMI2rHdmt2H-gIVxsiUCR0w3QmQEAAYASAAEgJz7fD_BwE&hvadid=617073423787&hvdev=m&hvlocphy=9007321&hvnetw=g&hvqmt=e&hvrand=5687664541393370540&hvtargid=kwd-298157213999&hydadcr=15221_13597780&keywords=internal+aquarium+filter&qid=1662727126&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyNEhKUjcyUTdSQlE3JmVuY3J5cHRlZElkPUEwMTA3NDYyMlE5Vk5KREhWQ1ZOVCZlbmNyeXB0ZWRBZElkPUEwOTMzMDM3MjRXQVBURFhSMlkyJndpZGdldE5hbWU9c3BfcGhvbmVfc2VhcmNoX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=