I need a little help deciding on a tetra to finish the stock on my 75. I have lots of fake plants, driftwood, and a couple rocks. Filtered with a cascade 1000 canister, Aquaclear 50 HOB, and Whisper 60 HOB. I currently have 1 Severum, 3 keyholes, and 3 angels. All are still juvies so hopefully they don't try to make snacks out of my new additions. I wanted to get Buenos Aires Tetra, but have read they can be nippy. Do you think in a group of about 10 they would keep it to themselves? Or should I find another tetra that won't go for my Angels fins?