
I am not surprised at all. I kept one black angel with 4 jumbo size Green Terror in a 75 for over a year. I thought the angel wouldn't last for a few days, because if the GT chose to attack her, she was too slow to run or hide. But the GT ignored her completely, as the angel looks unappetizing and non-threatening. Initially, the angel was very timid and hided in the corners for weeks before coming out. Once she got used to the big guys, she showed no fear anymore and competed with the GT for food. Eventually, after a year, she laid eggs on an intake tube and guarded the eggs bravely by attacking the GT. I was afraid she would get hurt by being the aggressor so I sold her in an auction, still commanded high price with a few scars from skirmish with the GT.
There is greater danger to keep angels with tiger barbs and some tetra than with giants as it is enticing for small fish to nip on their trailers.
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