AqAdvisor is quite accurate and I use it a lot to check some combinations. Needless to say, you should also always do you're own research before applying what is stated, and assimilating information.
If i am correct, if they are less then 5, it can bring some unwanted behavior. I checked on a few website, they also recommend at least 6. So I wouldn't expect something exceptional at 3 or 4. I heard that if you don't put them in a school of a high enough amount, it can start behavioral conflicts and fin nipping.
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Oscar and ClownKnife Fish Lover
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