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U can keep them all together. Just make sure they have enough room around them that they wont grow into each other or sting each other. I have a leather on bottom and most sps on upper half
TOO many softies in a SPS tank will be a problem though. For one thing, they tend to do better under dirtier water and two, the softies release something that is not good for sps. With the right balance of course you can still have a mixed reef, just a little harder from my understanding.