I'd use rocks, driftwood, and java ferns or other tough plants attached to the rocks and/or driftwood. Oscars like to use fake plants as toys.
If you can, I've seen some really cool setups that use amethyst and colored or clear quartz crystals. I might try using crystals myself with my next tank.
If you can, I've seen some really cool setups that use amethyst and colored or clear quartz crystals. I might try using crystals myself with my next tank.