Slakker, yes I've had three in one before, but for good reason and with extreme caution. There was absolutely no way I would do that without watching it the whole time.
Here's how it started...
I have four tanks
One has a pair of picassos, one has a pair of 1 WC onyx and one TR picasso, and one had a WC jigsw and an WC onyx.
The jigsaw and onyx never paired up. The jigsaw sat in the BTA and the onyx in his spawn. They were both juvis, but showed no interest in each other. The jigsaw was completely docile. I had a chance to get another picasso and decided it was a good time to find the other onyx(the one that never took to the jigsaw) a pair. Since hosting separate sites and having no interest in each other, although a risk, adding another juvi with two juvis was a calculated risk. None of them fought with each other and each had their own little place. Withing two weeks, I took the jigsaw out, although there were still no signs of aggression. Since the jigsaw was hosting anems already, I decided to take another calculated risk. I put it in with my pair of picassos(bonded but still not mated). My hope for doing this would be that since the jigsaw already hosted a BTA, since the BTA in both tanks is the exact same one(cloned) and since the picassos didn't host the BTA, that the jigsaw would help teach them to host it. Within five minutes of putting him in, the picassos were down there with him. In juvenile state, and being fed as much as I do, I have little issues with aggression. No competition as they were not sexed and not paired. No reason to compete as they were really just companions. The jigsaw came out after a day in that tank and was brought to my LFS to give to her. All the fish that participated are doing absolutely splendid. The bond between the picassos is strong and now they host the anemone. The two picasso/onyx pairs are doing very well. There are no more than two clowns per tank now and although still juvenile, they are growing healthy and happily. The jigsaw is doing fine back with the LFA. This was in no way harmful or stressful (maybe a little confusing) to any of the fish. The time to worry about three in one tank is when they start showing signs of dominance and/or when they are becoming ready for reproduction. With tank raised, they are used to crowds as youngsters and the ones that were used for this were all siblings(all from ORA except for the onyx).
The jigsaw, being netted twice in that short of period may have been stressed, but by the time he was in the LFS tank, he was doing great and found a friend right away. Better than being a "third wheel". The param differences between the two tanks he visited in my home were negligable at that time.
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