11-29-2010, 07:04 PM
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First, I have moved the related posts to this new thread for you, Paul.
Now to your questions. I do not suggest or recommend mixing Tiger Barb with Angels, regardless of the tank size. If you check the info in the profiles on these two fish--second tab from the left in the blue bar across the top takes you to the profiles section, or you can click on the fish/plant name in posts when it is shaded--you will see why. This is asking for trouble, even in a very large space.
To the question on compatible fish for angels, some are suggested in the profile for Pterophyllum scalare, the common angelfish. Given its slow and sedate nature, a group (minimum 5-6 but in 500g many more would be a real spectacular site) in a planted tank with minimal water movement could be complemented nicely by many of the tetra in the Hyphessobrycon genus, particularly the Rosy Tetra clade. Hatchetfish at the top do well. Bottom fish like several species of Corydoras, a pleco, or several other possible catfish species. Provided the other fish are not rambunctious--avoid barbs and danio for this reason--they should be fine, though always remembering the angels will readily eat any fish small enough to fit in their mouths; this rules out most pencilfish and tetra that are "long" in shape like neons, glowlights, etc.
Hope this helps a bit. Feel free to ask questions.