04-30-2012, 12:35 PM
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I would keep a very close eye on things. Bloodfin (Aphyocharax anisitsi) are known to fin nip; it mentions this in our profile [click the shaded name] which recommends not maintaining them with long-fin fish (angels, Gourami, etc).
All species in this genus Aphyocharax are risky due to their tendency to get a bit feisty and nip. The Dawn Tetra, Aphyocharax paraguayensis, is clearly the nastiest of the bunch, a real terror with any other tankmates.
When fish are placed in a new environment they are always stressed to some extent, and this inhibits their behaviours. As they settle in, they may follow the norm for the species, or it may be even worse, or they may go the opposite and be withdrawn. Sometimes the size of the group affects this, sometimes the size of tank. The Serpae Tetra is almost a guarantee, as you found out, though some have had that "work" too. This is not black and white. But the inherent trait is there, so be vigilant.
On the opposite side of the coin, angelfish will naturally prey on small fish and the slender torpedo-shaped characins are easy targets. This will be more obvious as the angelfish grow. Good companions are many of the disk-shaped characins in the Rosy clade of Hyphessobrycon. Several are in our profiles. The Rosy Tetra, Roberts Tetra, Black Phantom Tetra, etc. The Serpae is in this clade too but this is obviously not a good match. The Bleeding Heart Tetra may be, although one member here had hers nip the angels to distraction and had to remove them. Another suitable tankmate is the Diamond Tetra.
Last edited by Byron; 04-30-2012 at 12:40 PM..