06-04-2013, 02:34 PM
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The short answer to your question is I don't think that there will be fish large enough to sex for sale, based on the one you have. If you are going to try to keep a school of rainbows with your bettas, then I would just stick to the one species and get as many as you're going to get. At least 4 or 5 more. The sexes will be what they will be. Watching their breeding behaviors is a big part of the enjoyment of keeping rainbows, so if that's not something you care for then I wouldn't get them, because they will do it every morning. Aggressive is relative, and stress is a part of life. If you want to keep fish in a stress free environment then it's best to stick to Corys and tetras. Otherwise, there is situational aggression with most fish - even with tetras. The stress you should be most concerned about is harassment.
It's not too late to take the rainbow back. It's certainly the "smart" thing to do. If you want to experiment, I will be watching closely to see how it goes, because that's something I find very interesting. Sent from Petguide.com App