I have a pair of Maroon clownfish & am not that familiar with Ocellaris other than seeing them in other systems. Maroon females get quite large & from what I've seen Ocellaris is a smaller species. The larger 2.5 inch fish you just added could very well already be a female, so it is unusual for your smaller one to be the aggressor. All we can really ever do is keep an eye on them & if one gets beat up too bad, take steps to remove it. Eventually they should sort out who's who & with any luck, you'll have a bonded pair. Mating could take longer, up to a year or more, depending on where they're at with regards to maturity.
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