Filaments or mascara barbs could work. They get pretty large.
To my happy surprise my LFS has full size dennison barbs...at $35 each. This seem about right or bloated pricing?
What size tank is your Oscar in one thing I've discovered is when you put silver dollars in a big enough tank they're actually quite chill
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May I offer the suggestion of giant danios? They are a nice size, fast, and won’t hurt your wallet too bad if the oscar decides he wants to eat one.
Filaments or mascara barbs could work. They get pretty large.