5 yr old singleton Male time to add females

[lissalana]

I have had my axie for 5 yrs, he is a leucistic. I would like to add a couple of different colored females. What size new axies are safe to add with him, or do I need to put them in a separate tank until they get about his size? Not sure what to do. He is a pretty good size guy from head to tip of the tail.

Would love some Input from those experienced. I have been out of pocket for about 5 yrs so I need to do my studies again.

Thank you in advance for your time and consideration!

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[Acacia]

How big is he now and what is the size of the tank he's in? Generally for adults they should be within an inch or two of each other.