I once had a black ice and snowflake together and they were an item from the start. Both were small and I purchased them at the same time and from the same display tank. Tank raised ORA.
Lost my snowflake one day (can't quite recall why) ...lfs happened to have another and bought it. Similar size. They never paired up...had only been about a week since losing the other one. My black ice semi tolerated the newcomer but would not pair.
After giving it a couple months I eventually traded the snowflake in for another black ice and instant attraction!
They are the same family but a different mutation. My feeling is they need to be introduced at same time. Your first clown is not recognizing the newcomer as one of its own. It's established and protecting his/her spot.
Now I have a pair of black ice snowflake clowns... The best of both worlds
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