You cannot mix discus with red-tailed black sharks and clown loaches. This will never work in a 55g. Discus tend to become stressed when the loaches roam around too much owing to their feisty nature. These also tend to be curious and may brush the discus with their whiskers or even nip their fins causing the discus to freak out. Red-tailed black sharks are belligerent and can cause issues with your rams, plecos, loaches and discus. Whatever your LFS says, do not believe in the instant they convince you it'll work.
What species is the pleco you are going to try?
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Let the loach assimilation begin!
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