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Old 01/03/2018, 11:37 AM   #1
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Join Date: Mar 2016
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What is the rational behind keeping odd number of certain fish?

It is a common advice to keep certain schooling and hierarchical fish like anthias or green chromis in groups of odd numbers.

What is the advantage of keeping 7 chromis compared 6 (aside from one extra chromis to deter aggression of course). Or like; Would 7 chromis be better than 8 chromis?

IME for green chromis best number is 1, 2, or 10+. Otherwise there is constant struggle between a small number of fish. I was able to have long term success with a pair and in the past with a school of 20+. But any other number never worked.

For Anthias, it is specie specific and it also depends on the male anthias's ability to keep the females as females. But generally 4 females per male works

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