1 adult leo can live in a 10-20 gallon tank. Housing more than is normally not advised unless you plan to breed, especially if it is your first time to take care of one to avoid issues like off-feeding due to stress, tail loss, fights, territorial aggression. A 30 gallon tank would be small for 3 leos in my opinion. If you do push thru with housing them together, be sure to have 2 other spare tanks in case aggression or off-feeding arises.





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