Short answer is - don't do it... If you want to find out by yourself, you may try.
More than one pair of clownfish in one tank will work only if the pairs can stay in different spots far away from each other with plenty of rock work to separate them and provide hiding spots, and (a plus) different anemones stay away (far far...) from each other as their hosts...It's not easy to achieve these in a 90 gallon.
Some even reported failures in much larger systems. I suggest keep it simple, enjoy what you have and only add compatible animals into your system.
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