invertabrates?

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What size oscar? If its 5-6 inches i would go with a crawdad or maybe a large apple snail.
 
Large apple snails or a lot of trumpet snails if you have a lot of gravel substrate for them to hide in.
 
Apple snails will never work. Trumpet snails or horned nerite snails will however. Make sure your water is hard and alkaline. Both are calcium absorbers and lack of calcium will cause shell erosions.
 
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