A. aculeatus doesn't normally eat fish, but with my last male octopus, I experimented with some of my SW molly fry, just to see...sure enough, he stalked and ate them. These were very small fry - maybe .25-.5 inches? Certainly not enough to sustain an octopus long-term, and I only did it once or twice as an experiment (and with close supervision to make sure they molly fry did not harass him).
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72g: Percula pair, Foxface, Kole tang, Midas Blenny, Blue/green chromis, Yellow & green clown goby pairs
Office Nano Tank System (29 Gallon + 20 Gallon): Saltwater mollies + fry
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