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How compatible are the two type of fish if the neon tetra is some what baby sized while my discus are large large adults?
I second that opinonIf the neons are mature-sixed (around 1" or more), there should not be a problem.
However, Neons have a tough time with discus temps, and don't generally do well.
Go instead with larger Cardinal Tetras - they're much better as discus tankmates.
those sharp rocks might hurt the discus and better be avoided i am afraid...