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if they are all the same they should be fine...I got 9 in a 300..had 8 then added a 9th one because we adopted it from someone tearing a tank down.
The two bigger ones fight a lot right nowIf you get two pairs, you may find that the females may end up fighting. Not sure how these disputes will pan out in a 90 gal, but I've personally been able to keep small harems in smaller tanks with little to no fighting. Albeit it was because the males were all from the same tank originally, but I would monitor the fish closely and watch for any severe fighting.
The two bigger ones fight a lot right now
Is this two females?If you get two pairs, you may find that the females may end up fighting. Not sure how these disputes will pan out in a 90 gal, but I've personally been able to keep small harems in smaller tanks with little to no fighting. Albeit it was because the males were all from the same tank originally, but I would monitor the fish closely and watch for any severe fighting.
If they are fighting frequently, and their sizes are similar/bigger than the male, they may be two females duking it out. I've also read that locking mouths (as seen here) is a sign of females fighting. They may have already transitioned/are transitioning to females or are established females. I would recommend rehoming one of the females, as they'll most likely fight to the death. However, I'm once again not sure how these disputes will balance in a 90 gal
Might end up Selling one of the Big ones. I seperated Them and the other one is not Also attacking the small oneIf they are fighting frequently, and their sizes are similar/bigger than the male, they may be two females duking it out. I've also read that locking mouths (as seen here) is a sign of females fighting. They may have already transitioned/are transitioning to females or are established females. I would recommend rehoming one of the females, as they'll most likely fight to the death. However, I'm once again not sure how these disputes will balance in a 90 gal