Adding a fish to two clowns

[dirk33]

I have a new tank with 2 ocelaris clowns. They've been in there about a month and the larger of the two is getting very aggressive. If I have to put my hand in the tank for whatever reason she freaks out and nips at me.
I'm wondering if it will be on to add new fish to this tank. I would like to get a 6 line and a flame angel. The tank is a 29 biocube.
Thanks

 

[Fish4ever]

I have 2 ocellaris and the bigger one nips at me too when I feed I use a cup she will swim into it while I'm getting water!!