02-14-2011, 08:47 PM
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I also concur with Kym and Lupin on the cardinals. As angels mature, they attain 6 inches, and they are a predatory fish by nature. I know of aquarists who have had them eat full grown tetra like cardinals without any hesitation. It is always a risk.
On the rosy clade, my favourite is Hyphessobrycon bentosi or Roberts Tetra. I have these, and they are incredibly beautiful, a deep dark mauve colour, the males turn close to black, like the colour of port wine, when they display. The closely-related Hyphessobrycon rosaceus is very similar but not quite as intense or dark.
Some species like Bleeding Heart Tetra are said to fin nip angels; I believe our member Lisa had that problem. It is not "normal" but you never know, it's like the angel/cardinal question, when temptation is put in front of them... Bleeding hearts are a bit larger.
The Black Phantom Tetra and Red Phantom Tetra are also in this clade, and they are fine. A group of Black would actually look nice with either of the afore-mentioned rosy or Roberts, I had this combo, very interesting as they all three remained together in the lower half of the aquarium, among plants. They, like the angels, dislike bright overhead light. Floating plants help with this.