11-30-2010, 07:01 PM
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Assuming the fish you already have are the Hengel Rasbora and Pristella Tetra, you should be OK if the Pristella are small now. Trigonostigma hengeli grow to about an inch but like the other 3 species in this genus are very peaceful. Pristella maxillaris when small will be no issue but if they are full size now they might show some curiosity in the Pearls depending how small they are. The Celestial Pearl Danio attains 3/4 of an inch max. As you noted, common names are confusing; this fish was once called the Galaxy Rasbora before it was scientifically sorted out, as is explained in our profile.
Such a small fish can get lost in larger tanks; and by this, I mean not only become invisible, but disappear too. I had an entire shoal of Boraras merah that one by one vanished in my former 70g tank which had no largish fish in it. My group of Boraras brigittae were in the 10g at first, and I have now moved them into the 33g with other very small fish, and they seem to be OK.
As noted in our profile, get a group so you will not have serious squabbles as you can with only a few. With thick plants, and I mean very thick, they should be fine. A truly beautiful fish.