I'd say 30-50 small tetras would be fine, as in your original suggestion.
Neons might be OK, but are usually found in cooler water temps than discus. Cardinals would be my first recommendation (but I'm also admittedly biased! LOL)
Do you have any scavengers in there other than algae eaters? Cories would be my first thought... discus can be messy eaters, and do need meaty foods that will foul a tank pretty quickly if not taken care of.
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