Oscars were on the early list, but I'm trying to break up the trophic cascade: essentially the predator will be too large to eat/see as pray the colourful mosquito control fish. Thus rainbows & silver arowana. Yes, for the first 10-18 months there will be plenty of predation, but I reckon after about 18" the aros won't even see the rainbows... and they're quick as hell so the gambuzia & guppies will be the main fodder for the growing aros. We're making a kitchen scraps-brew of lobster & prawn heads blended with gelatine in the villa kitchen for the aros as well, and the place is rife with massive flying bugs & beetles (and bats & dragonflies & hummingbirds... requiring a web-cam) for alternative feed as well.
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