Ok well if you break t down into types.. Then it might be easier for you. If it's silvers you want, no matter what, you are rolling a dice with drop eye. There is no absolute fact that your fish will get drop eye but it's highly likely since they are inbred like crazy so getting more than one is ok. No more than 2 though. For Asian arowanas and all other short body arowana like jardini and greens then only one due to aggression problems. If you are getting a black Or blue, the you can house 2 at most, one at best since they have a lower rate of getting drop eye than silvers. Btw short
bodies rarely get drop eye, if you do then your doing something wrong. Silvers and blacks are relatively docile compared to short bodies so they are easier to train. As long as they are well fed then they shouldn't fight.
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