Sounds like you already know that answer but are hoping for a better one. Who knows but I'd bet if you tried it you would find out in a hurry. Sure they are small fish and a 300 is a lot of space. What is your reasoning behind this? I would guess that if you could find one of the opposite sex from your's you might be fine.
I've got 3 of them in a 450g. They are all a little over 3" and have only had them for a little over a month with occasional chasing but nothing aggressive.
All three swim together and so far I'm very glad I tried it. However I wouldn't add another since that one is established.
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