An Ocellaris should bepretty easy to pair. Still better to be safe and try the clear container method. The one in the tank may go ape **** for a while trying to get at the other one. But that will blow over. If it even happens at all. Ocellaris are a lot more tame than GSMs. Mine almost beat herself stupid from trying to get the new clown. But now they are laying eggs together. So they are as happy as can be.